29 Jun 25

Priorslee Balancing Lake and The Flash

17.0°C > 21.0°C: Mainly overcast with only a few breaks. Light south-westerly breeze. Excellent visibility.

Sunrise: 04:49 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 – 09:55

(159th visit of the year)

Bird notes:
- the Canada and Greylag goslings all still present and correct though the supernumerary adult Greylag Goose was chased away after at least two weeks as part the gang.
- a visiting Mute Swan arrived and was eventually chased away. Only the resident cob did the chasing.
- only three groups of Mallard ducklings seen: those of two, four and a single small duckling. The sailing club arrived early to set-up for the day and the usual loafing area for the Mallard and Coots was cleared. As a result some numbers are smaller than usual as birds sought shelter in the reeds.
- the duck Pochard present.
- a drake Tufted Duck was present early only
- the Little Grebe was heard calling again.
- *the third pair of Great Crested Grebes with juveniles seems to have four.
- a group of 12 apparent Feral Pigeons flew West at 05:15. Surely too early for Racing Pigeons. Might some of the local "roof birds" roost in nearby woods and this was a return to the estate area?
- the Garden Warblers was singing frequently again.
- more corvid confusion. Mainly about Rooks today. After 17 were noted outbound from their roost site(s) in small groups a party of 42 flew the other way at 05:30. Then at 05:40 a mixed group of 18 Jackdaws and 32 Rooks flew outbound.

Bird(s) noted flying over here:
- 12 Feral Pigeons: see notes
- 77 Wood Pigeons
- 11 Lesser Black-backed Gulls again
- 26 Jackdaws
- 98 Rooks: see notes

Counts from the lake area:
- 4 + 1 (1 brood) Canada Geese
- 3 + 3 (1 brood) Greylag Geese
- 3 Mute Swans: see notes
- 17 (?♂) + 7 (3 broods) Mallard: see notes
- 1 (0♂) Pochard
- 1 (1♂) Tufted Duck: departed
- 4 Moorhens
- 63 adult and juvenile Coots
- 1 Little Grebe: heard only
- *7 + 6 (3 broods) Great Crested Grebes: see notes
- 7 Lesser Black-backed Gulls
- 1 Grey Heron

Hirundines etc. noted:
- 2 Swifts
- 1 Barn Swallow

Warblers recorded (the figure in brackets is birds noted singing):
- 1 (1) Cetti's Warbler
- 12 (8) Chiffchaffs
- 11 (7) Reed Warblers
- 10 (7) Blackcaps
- 1 (1) Garden Warbler

Noted on the West end street lamp poles around-dawn:

Moths:
none

Spiders, harvestmen etc.:
*Bridge Orb-web Spider Larinioides sclopetarius

Noted later:
Still breezy and cloudy early on.

Butterflies:
*Small Skipper Thymelicus sylvestris
Large White Pieris brassicae
Small White Pieris rapae
Green-veined White Pieris napi
Speckled Wood Pararge aegeria
Ringlet Aphantopus hyperantus
Comma Polygonia c-album

Moths
1 Common Nettle-tap Anthophila fabriciana
3 Common Marbles Celypha lacunana
*1 Garden Grass-moth Chrysoteuchia culmella [was Garden Grass-veneer]
*$ 1 White-banded Grass-moth Crambus pascuella [was Inlaid Grass-veneer]
*$1 Pale Straw Pearl Udea lutealis
*1 Shaded Broad-bar Scotopteryx chenopodiata

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
*$$ possible social wasp Symmorphus bifasciatus
*ichneumon Amblyteles armatorius
*unidentified small ichneumon

Hoverflies:
*$$ probable Houseleek Blacklet Cheilosia caerulescens
Bumblebee Blacklet Cheilosia illustrata
Stripe-backed Fleckwing Dasysyrphus albostriatus [Stripe-backed Brusheye]
Marmalade Hoverfly Episyrphus balteatus
Tapered Dronefly Eristalis pertinax
Common Dronefly Eristalis tenax
*Migrant Field Syrph Eupeodes corollae [Migrant Hoverfly; Migrant Aphideater]
Meadow Field Syrph Eupeodes latifasciatus [Broad-banded Aphideater]
Chequered Hoverfly Melanostoma scalare [Long-winged Duskyface]
*Dead-head Hoverfly Myathropa florea [Common Batman Fly]
*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]
many damselflies not specifically identified

Lacewings:
none

Other flies:
Black Snipefly Chrysopilus cristatus
*Tachinid fly Eriothrix rufomaculata [Red-sided Eriothrix]
plus
as usual many unidentified flies of many different species

Bugs:
none

Beetles:
7 Spot Ladybird Coccinella 7-punctata
pupae of Harlequin Ladybird Harmonia axyridis: many
Pollen Beetle Meligethes sp.
Common Red Soldier Beetle Rhagonycha fulva [Hogweed Bonking-beetle]
*Spotted Longhorn Beetle Rutpela maculata [formerly Strangalia maculata]

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

Amphibians:
Common Frog Rana temporaria

Spiders, harvestmen etc.:
none

New flowers for the year:
*$$ Pale Persicaria Persicaria lapathifolia

The visiting Mute Swan. It is just possible to see that it has a blue Darvic ring on the left leg. Sadly none of the photos showed the leg clear of the water to enable me to read it.

The adult Great Crested Grebe seems to have arranged the four juveniles neatly.

A juvenile Carrion Crow. Note the slight gape line and some fluffy juvenile feathers on the flanks.

Song Thrush not banging a snail for a change. Just sitting on a fence.

Another Small Skipper butterfly Thymelicus sylvestris with its tongue in a Common Knapweed Centaurea nigra.

And here is real close-up to show we can discount it being an Essex Skipper T. lineola (which despite its name is possible here) as that species has jet-black tips to its antennae.

One of those pesky grass moths. It is a White-banded Grass-moth Crambus pascuella which used to be called Inlaid Grass-veneer. As with most grass moths they are seen flushed from the grass, fly erratically at speed and suddenly grab hold of a grass stem and collapse making them very hard to locate. Moth species #56 for me here this year.

They usually end up head-down along a grass stem as this Garden Grass-moth Chrysoteuchia culmella has done.

First sighting of this moth this year. It is a Pale Straw Pearl Udea lutealis frequently flushed from long grass. Moth species #56 for me here this year.

It was eight days ago I threatened to find a better photo of a Shaded Broad-bar Scotopteryx chenopodiata. At last!

This Honey Bee Apis mellifera is not a very "busy bee" as there is no pollen in the pollen baskets on the hind leg.

The best fit from the photos on the NatureSpot site is the social wasp Symmorphus bifasciatus.

"Leave those blackberries for later when they are ripe.. You will get tummy ache eating then unripe!" This seems to be the ichneumon Amblyteles armatorius

An unidentified small ichneumon wasp.

Sadly the insect in the foreground here will have to stay a "probable". Obsidentify was sure it is a Houseleek Blacklet Cheilosia caerulescens but I cannot get enough confirmation with the photos on Steven Falk's Flickr site to be sure - where are the white knees? This species is a recent colonist to the UK, probably brought in with a consignment of alien houseleeks (also known as "hen and chicks") originating in southern Europe. [at the back is an out-of-focus Common Red Soldier Beetle Rhagonycha fulva.]

Not new for the year however I do not spot this species of hoverfly very often. It is a Stripe-backed Fleckwing Dasysyrphus albostriatus which Obsidentify calls a Stripe-backed Brusheye. The identification features are that the yellow marks angle downwards and there are two stripes on the thorax.

Apart from being common and attractively-marked a feature of Marmalade Hoverflies Episyrphus balteatus is that they are remarkably approachable and content for the camera (or me) to be inches away from them.

The Field Syrph hoverflies can be difficult to separate. Here is a Migrant Field Syrph Eupeodes corollae (also known as Migrant Hoverfly or Migrant Aphideater) which is identified by the yellow bands extending around the sides of the abdomen.

Close-up with a Dead-head Hoverfly Myathropa florea.

Two for the price of one. I scratched my head over the small flying hoverfly. While it looked somewhat like a Common Twist-tail Sphaerophoria scripta (or Long Hoverfly) the yellow bands seemed very narrow and angled downward. Searching through Steven Falk's photos I noted several females that had very narrow bands and I think the angled effect it just because I am looking side-on. The hoverfly on the right is a Syrphus sp.. either S. ribesii / S. vitripennis.

A fly that is relatively easy to identify. It is the Tachinid fly Eriothrix rufomaculata which Obsidentify calls, with justification, Red-sided Eriothrix.

A great-looking beetle: a Spotted Longhorn Beetle Rutpela maculata.

It is a while since I saw one of these: a Bridge Orb-web Spider Larinioides sclopetarius.

A new plant for me: Pale Persicaria Persicaria lapathifolia.

(Ed Wilson)

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In the Priorslee Avenue tunnel:

Moths:
*$1 Double-striped Pug Gymnoscelis rufifasciata
1 Small Dusty Wave Idaea seriata

Flies
14 midges of various species.

Spiders, harvestmen etc.:
none

My first Double-striped Pug Gymnoscelis rufifasciata of the year. Pug moth species seem to like the tunnel: my fourth species this year none of which I have seen elsewhere. It is surprisingly the 21st species of moth I have found in the tunnel this year.

(Ed Wilson)

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The Flash: 06:25 – 07:35

(157th visit of the year)

Bird notes:
- just three adult Mute Swans noted.
- yesterday's late brood of three Mallard ducklings not seen.
- 11 Tufted Duck: seven drakes though it is getting hard to tell as they moult.
- fewer Coots counted. For some reason there was no gathering alongside the eastern edge of the island today and those I did find were scattered around.
- at least four and possibly five Great Crested Grebes. Singles sitting on nests at the top end and alongside the island. Singles seen in the water close-by to each nest site. One seen elsewhere may have been one of these – I could never see all five at the same time.
- two adult Cormorants flew in together and stayed in the water only a few minutes before departing. Too much weed?

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

Noted on / around the water:
- 179 Canada Geese
- 36 Greylag Geese
- 1 mainly white feral goose
- 3 Mute Swans
- 24 (?♂)Mallard
- 11 (7♂) Tufted Duck
- 8 + 2 (1 brood) Moorhens
- 38 + 9 (3 broods) Coots
- 4 (5?) Great Crested Grebes: see notes
- 2 Cormorants: arrived and departed together

Hirundines etc. noted:
None

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

Noted around the area:

Butterflies:
Green-veined White Pieris napi

Moths [on street lamp poles and in the grass]
1 Common Nettle-tap Anthophila fabriciana
4 Common Marbles Celypha lacunana
3 Garden Grass-moths Chrysoteuchia culmella [was Garden Grass-veneer]
*1 Mottled Beauty Alcis repandata

Bees, wasps etc.:
Common Carder Bee Bombus pascuorum
Buff-tailed Bumblebee Bombus terrestris
Common Wasp Paravespula vulgaris

Hoverflies:
Marmalade Hoverfly Episyrphus balteatus

Dragon-/Damsel-flies:
none

Other flies:
numerous different midges and flies

Bugs:
*$ instar of Common Green Shieldbug Palomena prasina

Beetles:
larvae of Alder Leaf Beetle Agelastica alni
pupae of Harlequin Ladybird Harmonia axyridis
Rough-haired Lagria Beetle Lagria hirta
Common Red Soldier Beetle Rhagonycha fulva [Hogweed Bonking-beetle]

Spiders, harvestmen etc.:
Long-jawed Orb-web Spider Tetragnatha sp.

New flowers for the year:
None

This somewhat worn Mottled Beauty moth Alcis repandata was resting on vegetation and asking to be eaten. I saw it first. My 42nd moth species around The Flash in 2025.

A distinctive-looking fly. Obsidentify was clear it was a Muscid fly. A search of the photo galleries in NatureSpot and eakringbirds failed to come up with an identity.

An early instar of a Common Green Shieldbug Palomena prasina . That is a grass "flower" it is resting on to give some idea of scale. It is the first instar or adult of this usually common species that I have seen this year.

(Ed Wilson)

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2013
Priorslee Lake
15 Cormorants
(Ed Wilson)

2011
Priorslee Lake
Common Sandpiper
(Ed Wilson)

2010
Priorslee Lake
Juvenile Yellow Wagtail
(Ed Wilson)

2009
Priorslee Lake
Siskin
(Ed Wilson)

2006
Priorslee Lake
2 drake Ruddy Ducks
(Ed Wilson)