9 Jul 25

Priorslee Balancing Lake and The Flash

14.0°C > 21.0°C: Broken cloud with only a few sunny intervals. Light westerly breeze. Very good visibility.

Sunrise: 04:58 BST

* = a species photographed today
$ = my first sighting of the species for this year
$$ = my first ever recorded sighting of the species in the area

Priorslee Balancing Lake: 05:00 – 06:20 // 07:40 – 10:00

(166th visit of the year)

Bird notes:
- the Greylag Geese parents and their three goslings have left. The supernumerary adult Greylag is still present along with eight Canada Geese which includes the now fully grown gosling.
- only the cob resident Mute Swan was noted. He made one visit to the nest area.
- five groups of Mallard ducklings seen: the duo; the familiar group of four; now only nine well-grown birds; a group of five and yet another new brood of eight. *The ducklings in this latter brood are wayward, scattering away from Mum on occasions.
- I think we can say the the duck Pochard has definitely gone. I hope she grew new wings and flew away.
- *there are three juvenile Great Crested Grebes in what I though were the newest brood. I was confused by finding a single juvenile in a fourth brood, this about the same size as the three.
- there were seven Black-headed Gulls on the football field at 06:10. I am presuming the few on the grass and buoys at the lake later were the same birds.
- a Common Kestrel flew south-west across the water at 08:45.
- I did not hear the Cetti's Warbler this morning. However while using the Merlin app to decide whether I was hearing Coal Tit or Tree Creeper (the answer was both!) the app recorded Cetti's Warbler. So...?
- a Garden Warbler only heard calling.
- a Common Whitethroats also only heard calling.
- a very small movement of Jackdaws and Rooks with almost as many after 08:00 as the usual 05:30 timing.

Bird(s) noted flying over here:
- 4 Greylag Geese
- 92 Wood Pigeons
- 3 Lesser Black-backed Gulls
- 1 Common Kestrel
- 18 Jackdaws
- 15 Rooks

Counts from the lake area:
- 7 + 1 (1 brood) Canada Geese
- 1 Greylag Goose
- 1 Mute Swan
- *25 (?♂) + 28 (5 broods) Mallard: see notes
- 7 Moorhens
- 98 adult and juvenile Coots: more late new broods
- *8 + 6 (4 broods) Great Crested Grebes: see notes
- 7 Black-headed Gulls: see notes
- 2 Herring Gulls
- 3 Lesser Black-backed Gulls
- 1 Grey Heron

Hirundines etc. noted:
- 5 Swifts
- 2 House Martins

Warblers recorded (the figure in brackets is birds noted singing):
song now much diminished
- ? Cetti's Warbler: see notes
- 7 (6) Chiffchaffs
- *10 (5) Reed Warblers
- 6 (4) Blackcaps
- 1 (0) Garden Warbler
- 1 (0) Common Whitethroat

On the West end street lamp poles around-dawn:

Nothing was noted

Moths:
*1 Common Plume Emmelina monodactyla

Spiders, harvestmen etc.:
1 Bridge Orb-web Spider Larinioides sclopetarius
1 harvestman Dicranopalpus ramosus/caudatus
1 harvestman Leiobunum blackwalli / rotundum

Noted later:

Butterflies:
Large White Pieris brassicae
"unidentified whites"
Speckled Wood Pararge aegeria
Ringlet Aphantopus hyperantus
*Meadow Brown Maniola jurtina
*Gatekeeper Pyronia tithonus

Moths [62 species here before today; one addition today]
$ >12 Horse-chestnut Leaf-miner Cameraria ohridella
2 Pale Straw Pearls Udea lutealis
*3 Shaded Broad-bars Scotopteryx chenopodiata
*1 caterpillar of Vapourer Orgyia antiqua
1 caterpillar of Cinnabar Tyria jacobaeae

Bees, wasps etc.:
Honey Bee Apis mellifera
Red-tailed Bumblebee Bombus lapidarius
Common Carder Bee Bombus pascuorum
Common Wasp Paravespula vulgaris

Hoverflies:
Bumblebee Blacklet Cheilosia illustrata [Bumblebee Blacklet]
*Parsley Blacklet Cheilosia pagana
*Stripe-backed Fleckwing Dasysyrphus albostriatus [Stripe-backed Brusheye]
* $ Broad-banded Epistrophe Epistrophe grossulariae [Black-horned Smoothtail]
*Marmalade Hoverfly Episyrphus balteatus
Tapered Dronefly Eristalis pertinax
Migrant Field Syrph Eupeodes corollae [Migrant Hoverfly; Migrant Aphideater]
Meadow Field Syrph Eupeodes latifasciatus [Broad-banded Aphideater]
*Common Spotted Field Syrph Eupeodes luniger [Lunuled Aphideater]
*Chequered Hoverfly Melanostoma scalare [Long-winged Duskyface]
*Banded Meliscaeva Meliscaeva cinctella [Banded Thintail]
Syrphus sp. S. ribesii / S. vitripennis

Dragon-/Damsel-flies:
Common Blue Damselfly Enallagma cyathigerum [Common Bluet]
where have all the Azure Damselfly gone?
unidentified hawker sp.

Lacewings, caddis flies etc.:
unidentified leafhopper

Other flies:
none specifically identified
plus
as usual many unidentified flies of many different species

Bugs:
none

Beetles:
7 Spot Ladybird Coccinella 7-punctata
Common Red Soldier Beetle Rhagonycha fulva

Slugs, snails etc.:
White-lipped Snail Cepaea hortensis

Amphibians:
none

Spiders, harvestmen etc.:
money spider Erigone sp.
*Zebra Spider Salticus scenicus

New plants for the year:

None

The latest brood of eight small Mallard. These are tending to scatter all over and I am not sure Mum will be able to protect them.

A parent Great Crested Grebe with the three juveniles. Note that even at this age the juveniles have huge feet – the bird on the left is waving one about. All the better to paddle and dive with.

A parent arrives with food...

...which soon wakes the juveniles up.

A fledged juvenile Reed Warbler peeking out at me.

And apparently not pleased with what it sees.

An acrobatic juvenile Blue Tit gathering insects from the umbellifers.

It is the yellow tone to its belly that suggests it is a juvenile.

A perfectly posed male Gatekeeper Pyronia tithonus – the dark in the forewing indicates it is a male. Two white spots in the black circle for this species....

 ...but only one for the larger Meadow Brown Maniola jurtina.

Leaves of Horse-chestnut Aesculus hippocastanum showing the damage inflicted by the larvae of the Horse-chestnut Leaf-miner moth Cameraria ohridella. At least a dozen tiny (5mm long) moths were flying around but would they land? Nope. All I managed was...

...this equally tiny and unidentified leafhopper.

At last: a moth on the street lamp poles here. A Common Plume Emmelina monodactyla. This species has multiple broods per year and I saw my first on 25 March.

A Shaded Broad-bar moth Scotopteryx chenopodiata.

This is bizarre for two reasons. Firstly the evolutionary result of this caterpillar of Vapourer Orgyia antiqua is unusual to say the least. Secondly this is the fourth example I have recorded this year, all on the surround of the "boxing ring" on the dam. The first was on 20 May so there is zero chance of them all being the same individual.

A perfect plan view.

A Parsley Blacklet hoverfly Cheilosia pagana.

A paler yellow on this hoverfly, with the yellow bands separated in the middle and two slightly divergent streaks on the thorax this is a Stripe-backed Fleckwing Dasysyrphus albostriatus.

Another "different-looking" hoverfly from all the many black and yellow species. The wide, parallel-sided yellow bands and the two streaks down the thorax identify a Broad-banded Epistrophe Epistrophe grossulariae which for some reason Obsidentify calls Black-horned Smoothtail. The antennae are not sufficiently visible here to know whether it has black horns.

Not really a stand-off as many species of hoverfly were sharing the umbellifers. On the left a Banded Meliscaeva Meliscaeva cinctella and on the right a Marmalade Hoverfly Episyrphus balteatus.

The moustache-like yellow marks suggest this is a Common Spotted Field Syrph Eupeodes luniger.

This gives a good idea of the size of a Chequered Hoverfly Melanostoma scalare, here sitting on just one flower of one umbel of a Common Hogweed Heracleum sphondylium.

Two species of bug on a Common Knapweed Centaurea nigra flower. I cannot identify either!

On the wall of the sailing club HQ I found two Zebra Spiders Salticus scenicus. Here is one..

...and the other. When I was in Kenya the Zebras seemed differently marked!

(Ed Wilson)

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In the Priorslee Avenue tunnel:

Moths: [26 species here before today; no additions]
none

Flies:
8 moth flies Psychodidae sp. [Drain Fly or Owl Fly]
8 midges of various species.

Spiders, harvestmen etc.:
none

(Ed Wilson)

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The Flash: 06:25 – 07:35

(164th visit of the year)

Bird notes:
- a few geese of both species were seen making tentative flights on new wings. Many are obviously some way away from the feathers having regrown sufficiently.
- *unexpected at this date were two Shoveler. Both out of plumage and at some distance but I would judge a drake and a duck.
- the late brood of two Mallard ducklings not noted.
- 11 Tufted Duck only.
- again only two Great Crested Grebes found. Both in open areas of water a ways away from each other and staying that way.

Bird(s) noted flying over here:
- 2 Jackdaws

Noted on / around the water:
- 153 Canada Geese
- 74 Greylag Geese
- the mainly white feral goose not noted
- 6 Mute Swans
- *2 (1♂?) Shoveler
- 9 (?♂) Mallard: see notes
- 11 (8♂) Tufted Duck
- 5 + 1 (1 brood) Moorhens
- 67 + 8 (4 broods) Coots: two new broods noted
- 2 Great Crested Grebes again: see notes

Hirundines etc. noted:
- 2 Swifts

Warblers recorded (the figure in brackets is birds noted singing):
- 4 (3) Chiffchaffs
- 4 (3) Blackcaps

Noted around the area:

Butterflies:
none

Moths [on street lamp poles and in the grass] [50 species here before today; one addition today]
*1 $ Hoary Tortrix Eucosma cana [was Hoary Bell] [moth species #51]
1 Common Grass-moth Agriphila tristella [was Common Grass-veneer]

Bees, wasps etc.:
*$$ possible Saxon Wasp Dolichovespula saxonica
Common Wasp Paravespula vulgaris

Hoverflies:
Marmalade Hoverfly Episyrphus balteatus
Meadow Field Syrph Eupeodes latifasciatus [Broad-banded Aphideater]
Common Spotted Field Syrph Eupeodes luniger [Lunuled Aphideater]
Chequered Hoverfly Melanostoma scalare [Long-winged Duskyface]

Dragon-/Damsel-flies:
none

Other flies:
numerous different midges and flies

Bugs:
Common Flower Bug Anthocoris nemorum
*Mirid bug Plagiognathus arbustorum

Beetles:
larvae of Alder Leaf Beetle Agelastica alni
7 Spot Ladybird Coccinella 7-punctata
Common Red Soldier Beetle Rhagonycha fulva

Spiders, harvestmen etc.:
Long-jawed Orb-web Spider Tetragnatha sp.
harvestman Dicranopalpus ramosus/caudatus
female harvestman Leiobunum blackwalli

New flowers for the year:

None

Here are the two Shoveler I noted here. The right hand bird is, typically, sifting food with its bill from just below the surface.

This wasp struck me at the time as being unusually dark-looking. Obsidentify's first choice was Saxon Wasp Dolichovespula saxonica with Common Wasp Paravespula vulgaris being 25%. I am not sure but to my eyes the antennae look too long for a the Common Wasp though I cannot find that as a feature of Saxon Wasp in the literature.

A cooperative moth sitting on Common Ragwort Jacobaea vulgaris and allowing me to bend the plant over to get the best angle for an identification photo. It is a Hoary Tortrix Eucosma cana which used to be known as Hoary Bell. My 51st moth species here this year.

On my knuckle is a small Mirid bug Plagiognathus arbustorum.

(Ed Wilson)

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2012
Priorslee Lake
Grasshopper Warbler reeling
(Ed Wilson)

8 Jul 25

No sightings in today

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2007
Priorslee Lake
A pair of Siskins close to the lake
(Martin Adlam)

7 Jul 25

No sightings in today.

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2011
Priorslee Lake
Lesser Whitethroat
(John Isherwood)

2010
Priorslee Lake
2 Common Sandpipers
3 Common Terns
Kingfisher
50+ Swifts
(Ed Wilson)

2007
Priorslee Lake
1 drake Ruddy Duck
(Martin Adlam)

6 Jul 25

No sightings in today

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2010
Priorslee Lake
2 Common Sandpiper
(Ed Wilson)

5 Jul 25

Priorslee Balancing Lake and The Flash

16.0°C > 20.0°C: Early cloud broke for a while. Cloudy again later. Humid. Moderate south-westerly breeze. Excellent visibility.

Sunrise: 04:54 BST

There will be a few days break in the blog as I spend a few days with friends with little interest in wildlife despite my efforts! There are such people?

* = a species photographed today
$ = my first sighting of the species for this year
$$ = my first ever recorded sighting of the species in the area

Priorslee Balancing Lake: 05:00 – 06:20 // 07:45 – 09:40

(165th visit of the year)

Bird notes:
- the Greylag Geese parents and their three goslings took a short flight. No more than 50 yards but it is a start and the goslings looked confident-enough. The supernumerary adult Greylag was not noted.
- both resident Mute Swans were out and about much of the time.
- four groups of Mallard ducklings seen: the duo; the familiar group of four; ten well-grown birds; and five, with the ducklings the smallest of the groups.
- the duck Pochard not seen yet again: perhaps she has gone?
- there are still at least three juvenile Great Crested Grebes in the newest brood: two were in the water and at least one was on the parent's back.
- several small groups of Reed Warblers seen dashing about - fledged juveniles I expect.
- the Garden Warbler was in good voice.
- one Common Whitethroats seen briefly. No call or song heard.
- a more normal early movement of Jackdaws only outbound was eclipsed by a group of 56 and then 1 more inbound at 05:40. Why have the changed their routine of many years?

Bird(s) noted flying over here:
- 59 Wood Pigeons
- 1 Black-headed Gull
- 6 Lesser Black-backed Gulls
- 1 Grey Heron again
- 115 Jackdaws
- 9 Rooks only

Counts from the lake area:
- 4 + 1 (1 brood) Canada Geese
- 2 + 3 (1 brood) Greylag Geese
- 2 Mute Swans
- 22 (?♂) + 21 (4 broods) Mallard: see notes
- 3 Moorhens yet again
- 81 adult and juvenile Coots
- *7 + 5? (3 broods) Great Crested Grebes again
- 2 Black-headed Gulls, briefly and early
- 4 Lesser Black-backed Gulls again
- 1 Grey Heron again

Hirundines etc. noted:
- 14 Swifts
- 3 Barn Swallows
- 4 House Martins: juveniles calling and food-pass seen

Warblers recorded (the figure in brackets is birds noted singing):
- 1 (1) Cetti's Warbler
- 11 (9) Chiffchaffs
- 14 (8) Reed Warblers
- 9 (6) Blackcaps
- 1 (1) Garden Warbler
- 1 (0) Common Whitethroat

On the West end street lamp poles around-dawn:
Nothing was noted. I'm still not doing very well here this year.

Noted later:

Butterflies:
a good showing despite the cloud
Large White Pieris brassicae
Green-veined White Pieris napi
Small White Pieris rapae
Speckled Wood Pararge aegeria
Ringlet Aphantopus hyperantus
Meadow Brown Maniola jurtina
*Gatekeeper Pyronia tithonus
Red Admiral Vanessa atalanta

Moths [62 species here before today; additions in sighting order]
2 Common Nettle-taps Anthophila fabriciana
1 Common Marble Celypha lacunana
2 Pale Straw Pearls Udea lutealis
*2 Shaded Broad-bars Scotopteryx chenopodiata
2 caterpillars of Cinnabar Tyria jacobaeae : probably two of yesterday's trio

Bees, wasps etc.:
Honey Bee Apis mellifera
Red-tailed Bumblebee Bombus lapidarius
Common Carder Bee Bombus pascuorum
Buff-tailed Bumblebee Bombus terrestris
Common Wasp Paravespula vulgaris
*$ European Hornet Vespa crabro

Hoverflies:
Bumblebee Blacklet Cheilosia illustrata [Bumblebee Blacklet]
Dark-winged Wrinklehead Chrysogaster solstitialis
Stripe-backed Fleckwing Dasysyrphus albostriatus [Stripe-backed Brusheye]
*$$ possible Dark-backed Epistrophe Epistrophe nitidicollis
Marmalade Hoverfly Episyrphus balteatus
Meadow Field Syrph Eupeodes latifasciatus [Broad-banded Aphideater]
Common Twist-tail Sphaerophoria scripta [Long Hoverfly; Common Globetail]
Syrphus sp. S. ribesii / S. vitripennis

Dragon-/Damsel-flies:
Common Blue Damselfly Enallagma cyathigerum [Common Bluet]
Blue-tailed Damselfly Ischnura elegans [Common Bluetail]
where have all the Azure Damselfly gone?

Lacewings, caddis flies etc.:
none

Other flies:
*$ long-legged fly Dolichopus wahlbergi
*dagger fly Empis livida
plus
as usual many unidentified flies of many different species

Bugs:
*Hawthorn Shieldbug Acanthosoma haemorrhoidale

Beetles:
Alder Leaf Beetle Agelastica alni
7 Spot Ladybird Coccinella 7-punctata
Harlequin Ladybird Harmonia axyridis var. succinea
Rough-haired Lagria Beetle Lagria hirta
Pollen Beetle Meligethes sp.
*$$ larva of cereal beetle Oulema melanopus or similar
Common Red Soldier Beetle Rhagonycha fulva [Hogweed Bonking-beetle]

Slugs, snails etc.:
White-lipped Snail Cepaea hortensis

Amphibians:
none

Spiders, harvestmen etc.:
none

New plants for the year:
*$$ Fool's-water-cress Helosciadium nodiflorum

The first sunrise worth photographing for several days .

At long range but clearly the Great Crested Grebe has at least three juveniles. Could the original fourth be lurking somewhere?

Two Gatekeeper butterflies Pyronia tithonus .

By far the best example of a Shaded Broad-bar moth Scotopteryx chenopodiata that I have seen this year.

Could have been my insect of the day. Disappearing in to the rubbish bin is the tail end of what I believe to be a European Hornet Vespa crabro - I was slow on the draw. I hope it wasn't an invasive Asian Hornet! I kicked the bin (and stood well back!) to see whether it would re-emerge. It didn't.

I could only photograph this hoverfly at this angle before it flew off. Two things caught my eye: it looks broad-bodied; and the two yellow bands are parallel across the centre of the abdomen and show no kink at all. It may well be a Dark-backed Epistrophe Epistrophe nitidicollis . As that would be a new hoverfly species for me I am 'pending' the record until I can get a better example.

A long-legged fly Dolichopus wahlbergi . It is a male with the comb-like structure on its middle tarsus. "Why?" I hear you ask. Good question.

This dagger fly Empis livida seems to be after nectar rather than sucking the innards out of some poor creature. I didn't know they fed on nectar.

A Hawthorn Shieldbug Acanthosoma haemorrhoidale.

My best shot at this tiny creature is that it is a larva of the cereal beetle Oulema melanopus or similar.

A new plant for me: Fool's-water-cress Helosciadium nodiflorum .

(Ed Wilson)

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In the Priorslee Avenue tunnel:

Moths: [26 species here before today; no additions]
*1 Small Fan-footed Wave Idaea biselata
*1 Small Dusty Wave Idaea seriata
*1 Slender Pug Eupithecia tenuiata
*1 Wormwood Pug Eupithecia absinthiata : as yesterday

Flies:
2 moth flies Psychodidae sp. [Drain Fly or Owl Fly]
11 midges of various species.

Spiders, harvestmen etc.:
none

A bunch of moths on the ceiling today: a Small Fan-footed Wave Idaea biselata.

A Small Dusty Wave Idaea seriata.

A Slender Pug Eupithecia tenuiata.

And probably the same Wormwood Pug moth Eupithecia absinthiata as yesterday.

(Ed Wilson)

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The Flash: 06:25 – 07:40

(163rd visit of the year)

Bird notes:
- the late brood of two Mallard ducklings still present. Otherwise even more of the adult Mallard were hiding.
- 17 Tufted Duck again. Five of these went for a fly, almost certainly returning a few minutes later.
- only Great Crested Grebes found. Both in open areas of water a ways away from each other and staying that way.

Bird(s) noted flying over here:
- 7 Jackdaws

Noted on / around the water:
- 174 Canada Geese
- 29 Greylag Geese
- the mainly white feral goose not noted again
- 6 Mute Swans
- 4 (?♂) + 2 (1 brood) Mallard: see notes
- *17 (11?♂) Tufted Duck
- 6 + 3 (1 brood) Moorhens
- 74 + 6 (2 broods) Coots
- 2 Great Crested Grebes: see notes
- 1 Black-headed Gull: adult, briefly
- 1 Lesser Black-backed Gull: second year, briefly

Hirundines etc. noted:
- 2 House Martins

Warblers recorded (the figure in brackets is birds noted singing):
- 6 (4) Chiffchaffs
- 3 (3) Blackcaps yet again

Noted around the area:

Butterflies:
Green-veined White Pieris napi

Moths [on street lamp poles and in the grass] [49 species here before today; one addition today]
*1 Straw Grass-moth Agriphila straminella [was Straw Grass-veneer] [species #50]
*1 Blood-vein Timandra comae
*2 Riband Waves Idaea aversata
*1 Straw Dot Rivula sericealis

Bees, wasps etc.:
*Common Carder Bee Bombus pascuorum
Buff-tailed Bumblebee Bombus terrestris
*possible Vestal Cuckoo Bee Bombus vestalis [Vestal Cuckoo Bumblebee]
Common Wasp Paravespula vulgaris

Hoverflies:
*Stripe-backed Fleckwing Dasysyrphus albostriatus [Stripe-backed Brusheye]
Marmalade Hoverfly Episyrphus balteatus
Meadow Field Syrph Eupeodes latifasciatus [Broad-banded Aphideater]

Dragon-/Damsel-flies:
none

Other flies:
numerous different midges and flies

Bugs:
*Common Flower Bug Anthocoris nemorum
*Mirid bug Plagiognathus arbustorum
*Common Froghopper Philaenus spumarius

Beetles:
larvae of Alder Leaf Beetle Agelastica alni
Harlequin Ladybird Harmonia axyridis var. spectabilis
Harlequin Ladybird Harmonia axyridis var. succinea
Pollen Beetle Meligethes sp.
Common Red Soldier Beetle Rhagonycha fulva [Hogweed Bonking-beetle]

Spiders, harvestmen etc.:
harvestman Leiobunum blackwalli
*harvestman Leiobunum rotundum

New flowers for the year:

None

These five Tufted Duck took to the air...

...then returned a few minutes later. Three drakes with varying amount of smudging on the white flanks as they moult.

A second year Lesser Black-backed Gull. In wing-moult. The back and inner wing looks dark-enough to be a (sub)adult and the extensive pale to the base of the lower mandible suggests it is well on the way to be a third winter bird.

A Straw Grass-moth Agriphila straminella. Not a brilliant photo: it is often difficult to get close to the moths anyway and I am usually shooting at some distance and often between many other grass stems.

The second Blood-vein moth Timandra comae . Not much I could do about the 'splash' on the foliage.

One of two Riband Wave moths Idaea aversata this being, in our area, the less usual form with the solid band between the outer two cross-lines.

This is the typical form we see. Known as the form remutata.

A Straw Dot Rivula sericealis . It is several weeks since I saw my previous example. It still seems to be within the normal flight season.

An unusual view of a Common Carder Bee Bombus pascuorum.

I cannot get a positive ID on this bumblebee. Obsidentify suggested a possible Vestal Cuckoo Bee Bombus vestalis but Steven Falk's Field Guide suggests that cuckoo bees tend to be less hairy so...?

This hoverfly is a species I have not seen at The Flash before. It is a Stripe-backed Fleckwing Dasysyrphus albostriatus.

A Common Flower Bug Anthocoris nemorum on my palm.

And now a Mirid bug Plagiognathus arbustorum also on my palm. These two were on an umbellifer and difficult to photo so I banged the umbel against my hand and these two dropped off. If anyone is in to palmistry I do not want to know.

The Common Froghopper Philaenus spumarius stayed on the umbellifer.

A female harvestman Leiobunum rotundum. Unusually I found this on vegetation. I almost always find these on street lamp poles.

(Ed Wilson)

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2012
Priorslee Lake
Kingfisher
Grasshopper Warbler singing
(Ed Wilson)

2010
Priorslee Lake
2 Green Sandpipers seen flying from the lake towards Priorslee Flash: these were my first here for c.10 years
1 Common Sandpiper
House Sparrow unusual here
(Ed Wilson)

2005
Priorslee Lake
Possible Crossbills close-by
(Ed Wilson)