11 May 26

Priorslee Balancing Lake and The Flash

7.0°C: A few early clear spells. Then cloudy with a light shower before "rain stopped play" with a heavy shower. Moderate westerly wind, veering north-easterly during second shower. Very good visibility except during showers.

Sunrise: 05:19 BST

* = a species photographed today
$ = a new species for me in this area

Priorslee Balancing Lake: 05:15 – 06:25 // 07:20 – 09:25

(113th visit of the year)

Bird notes:
- *still seven Greylag Geese goslings present and correct.
- *the two very well-grown Mallard ducklings seen.
- a very low count of Coots even assuming half of those present are sitting on nests hidden in the reeds. Perhaps they were sheltering from the rain. Lucky them.
- three Lesser Black-backed Gulls visited briefly.
- no Grey Heron seen.
- the usual warbler update:
nine singing Reed Warblers one of which was in unsuitable-looking scrub: perhaps a passage bird?
the Garden Warbler was heard again – with difficulty as there were two shouting Song Thrushes, one on each side. The warbler is still not singing as persistently as this species usually does and I have yet to see it even move between song perches much less being able to think about photographing it.
I did not hear a Lesser Whitethroat today
two Common Whitethroats. At 05:30 one was singing close to the traditional breeding site: I did not see this bird. The recent arrival along the South side was still in full voice.

Bird(s) noted flying over here:
- 1 Lesser Black-backed Gull
- 3 Wood Pigeons only again
That's all folks!

Counts from the lake area:
- *2 + 7 (1 brood) Greylag Geese
- 2 Mute Swans
- *8 (6♂) + 2 (1 brood) Mallard
- 8 (7♂) Tufted Duck
- 2 Moorhens only
- 10 Coots only
- 7 Great Crested Grebes
- *3 Lesser Black-backed Gulls: two adults and a first year, all departed separately
- no Grey Heron

Hirundines etc. noted:
At least 80 birds swirling around over the water and sometimes up in the air. My best attempt to apportion them to species:
- 20 Swifts
- 20 Sand Martins
- *30 Barn Swallows
- *10 House Martins

Warblers noted (the number in brackets refers to birds singing):
- 16 (15) Chiffchaffs
- 10 (9) Reed Warblers
- 16 (16) Blackcaps
- no Lesser Whitethroat
- 2 (2) Common Whitethroats
- 1 (1) Garden Warbler

On the West end street lamp poles post-dawn:
Not quite a blank morning

Flies:
- 2 plumed midges

Noted around the area later:
Almost nothing in cool and then wet conditions:

Bees, wasps etc.:
- Buff-tailed Bumblebee Bombus terrestris

Bugs:
- *Red-and-Black Froghopper Cercopis vulnerata

A hungry brood of seven Greylag goslings.

The two well-grown Mallard ducklings still with their mother,

This is a first year Lesser Black-backed Gull though it is hard to tell from this angle. Indeed with the wings held forward the light shines through the spread inner primaries and it would be easy to assume it was a Herring Gull. Luckily I saw the top side before I could get the camera on it.

A Common Buzzard circling over Castle Farm Way....

 ...tail spread.

There was enough light to (almost) freeze the passing Barn Swallows. But not enough light to provide much in the way of colour.

My best from below...

 ...above...

...and the side.

 I even managed a shot of a House Martin.

Sadly not quite in focus.

Cool and overcast so I did not expect to see any Red-and-Black Froghoppers Cercopis vulnerata. It was before the rain.

(Ed Wilson)

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Noted in the Priorslee Avenue tunnel:

Flies:
- 11 midges of at least three species
- 1 moth fly Psychodidae sp. [Drain Fly or Owl Fly]
- *1 unidentified fly
- 1 unidentified cranefly

This unidentified fly falls in to the category "well I suppose they have to sleep somewhere". On a wall in the tunnel is an unusual location.

(Ed Wilson)

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The Flash: 06:30 – 07:15

(110th visit of the year)

Bird notes:
- the visiting first year Mute Swan was confirmed to be unringed.
- two pairs of Coots noted with two and four well-grown juveniles respectively.
- a Great Crested Grebe was seen bringing food to the bird on the nest platform

Bird(s) noted flying over here:
- 2 Canada Geese: a pair flew East
- 2 Lesser Black-backed Gulls

Noted on / around the water:
- 8 Canada Geese only: of these a pair departed to the North
- 2 Greylag Geese
- 5 Mute Swans: (assuming the resident pen is hidden on the nest)
- 20 (17♂) Mallard
- 3 Moorhens yet again
- 17 + 6 (2 broods) Coots
- 2 Great Crested Grebes

Hirundines etc. noted:
None

Warblers noted (the number in brackets refers to birds singing):
- 6 (6) Chiffchaffs
- 4 (4) Blackcaps

Notes around the area:

Flies:
- *at least 38 unidentified mayflies

Fish:
- *at least five, presumed Carp Cyprinus carpio ssp., thrashing around in close proximity

I counted 38 mayflies apparently dead on the same street lamp pole as yesterday. One was low-enough for a better photo. It does not help me identify the species.

One of at least five, presumed Carp Cyprinus carpio ssp., seen thrashing around. There were no fishermen around to ask: it seems to me both too early in the year and with the water likely too cold for them to be (thinking of) spawning. But what else?

(Ed Wilson)

10 May 26

Priorslee Balancing Lake and The Flash

7.0°C > 10.0°C: Early low cloud lifted and broke to give a few sunny intervals. Chilly, moderate north-easterly wind, ameliorated somewhat. Very good visibility.

Sunrise: 05:22 BST

* = a species photographed today
$ = a new species for me in this area

Priorslee Balancing Lake: 05:20 – 06:35 // 07:25 – 09:45

(112th visit of the year)

Bird notes:
- all seven Greylag Geese goslings present and correct.
- drake Gadwall seen first thing only.
- no Mallard ducklings seen.
- just three Tufted Duck, all drakes, noted.
- no visiting gulls albeit two of the ten over-flying Lesser Black-backed Gulls had a serious look at the football field before moving on.
- a Grey Heron by the dam-face early only.
- more changes in the warblers:
just eight singing Reed Warblers. Perhaps too breezy to hear all of them.
no Garden Warbler heard.
a Lesser Whitethroat was singing from scrub behind the sailing club containers at c.05:35 only. Whether this was a late arrival still looking for a territory or one of the previous songsters re-establishing its territory between broods is hard to say, though it would seem rather quick to have raised a brood already
*just the one Common Whitethroat: only singing while I was on my second lap.
- after several days with no Reed Buntings seen or heard along the South side one was heard sporadically singing along the North side.

Also of note is that there seem to be two pairs of Moorhens on the lower pool between the lake and The Flash, one pair with at least two juveniles. This is in addition to a pair (at least) on the upper pool – this is very overgrown and birds can usually only be seen when out on the grass. I cannot recall noting more than one pair in either pool previously.

Bird(s) noted flying over here:
- 1 Canada Goose: a single flew East.
- 3 Greylag Geese: a pair and a single flew West.
- 10 Lesser Black-backed Gulls
- 3 Wood Pigeons only

Counts from the lake area:
- 2 Canada Geese: a pair arrived and departed
- 2 + 7 (1 brood) Greylag Geese
- 2 Mute Swans
- 1 (1♂) Gadwall: departed?
- 10 (8♂) Mallard
- 3 (3♂) Tufted Duck
- 3 Moorhens
- 19 Coots
- 6 Great Crested Grebes
- 1 Grey Heron

Hirundines etc. noted:
Minimum numbers: I waited to do a full count when I was able to see the whole of the lake area. Before I could get in to position the sun came out and many of them departed.
- 8 Swifts
- 4 Sand Martins
- 10 Barn Swallows
- 2 House Martins

Warblers noted (the number in brackets refers to birds singing):
- 13 (12) Chiffchaffs
- 8 (8) Reed Warblers
- 13 (12) Blackcaps
- 1 (1) Lesser Whitethroat: see notes
- 1 (1) Common Whitethroat
- no Garden Warbler

On the West end street lamp poles post-dawn:
Another blank morning

Noted around the area later:
A cool breeze and little sun to temp much in to view:

Butterflies:
- none

Moths:
- *1 Plain Pollen-moth Micropterix calthella [was Plain Gold]: moth species #19 for me here this year

Bees, wasps etc.:
- *Early Bumblebee Bombus pratorum
- *unidentified ichneumon sp.

Hoverflies:
- *Buttercup Blacklet Cheilosia albitarsus
- also Buttercup Blacklet-type: either Cheilosia albitarsus or C. ranunculi.
- *Common Spotted Field Syrph Eupeodes luniger [Lunuled Aphideater]
- Chequered Hoverfly Melanostoma scalare [Long-winged Duskyface]
- Syrphus sp. S. ribesii / S. vitripennis / S. torvus

Dragon- / damsel-flies:
- *Azure Damselfly Coenagrion puella [Azure Bluet]

Alder and other four-winged flies:
- none

Other true flies:
- *dagger fly Empis tessellata
- *Yellow Dung Fly Scathophaga stercoraria
- *Tachinid fly: "flies in this Tachinid fly genus are difficult to identify" [NatureSpot]
- *other unidentified flies

Bugs:
- *Red-and-Black Froghopper Cercopis vulnerata

Beetles:
- 7 Spot Ladybird Coccinella 7-punctata
- Harlequin Ladybird Harmonia axyridis var. spectabilis
- also var. succinea

Spiders, harvestmen etc.:
- *Nursery Web Spider Pisaura mirabilis

New flowers for this year:
- *Spindle-tree Euonymus europaea

In the distance two Magpies try to move a Common Buzzard out of their territory.

Another trio of photos of the Common Whitethroat.

 Still singing away...

 ...with the wind ruffling his throat feathers.

Feeding in a buttercup flower is a Plain Pollen-moth Micropterix calthella. It has a small matching yellow tuft on its head. It used to be known as Plain Gold which is true only for fresh specimens with the light at the correct angle. It is moth species #19 for me here this year

It seems many days since I saw any bumblebees. This is my first Early Bumblebee Bombus pratorum of the year.

And like buses in London two come along together. This paler one is likely a male: the other probably a worker.

An unidentified ichneumon – as most specimens of this huge family will remain

A Buttercup Blacklet Cheilosia albitarsus with the decency to show it white front leg – the "albitarsus" that separates it from several similar species.

 A Common Spotted Field Syrph Eupeodes luniger (or Lunuled Aphideater)

A Syrphus species from one of S. ribesii / S. vitripennis / S. torvus

My first Azure Damselfly Coenagrion puella of the year. I recognise this species by the U-shaped mark on the top body segment. On Common Blue Damselfly Enallagma cyathigerum the mark is club-shaped. There is also a difference in the width of the pale areas on the thorax but I can never remember which is which. I cannot see any difference in the "blue" between the two species.

The best I could do to get a side-elevation view of the dagger fly Empis tessellata. The long "dagger" mouthpiece is reasonably clearly seen here.

A Yellow Dung Fly Scathophaga stercoraria a day keeps the... away. A male.

As yesterday there were a number of flies that I have not been able to or not had the time to identify. This one is hardly well camouflaged. Likely a Muscid fly.

The wing shape suggests this is a fly from the Muscid family in the genus Phaonia.

I am sure I have seen photos of this grey and hairy fly on the internet but I cannot locate them now. Probably a Tachinid fly.

Another Tachinid fly: "flies in this Tachinid fly genus are difficult to identify" [NatureSpot]

A two-fer. On the right a Greenbottle Lucilia sp. No idea about the other.

Another "greenbottle" but from a different family.

A smart Red-and-Black Froghopper Cercopis vulnerata

Sitting quietly on vegetation waiting for a meal to blunder by is a Nursery Web Spider Pisaura mirabilis, identified by the white line down the cephalothorax.

Another. The head shape is also distinctive.

These are the flowers of a Spindle-tree Euonymus europaea

(Ed Wilson)

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Noted in the Priorslee Avenue tunnel:

Flies:
- 4 midges of at least two species
- *2 craneflies Limonia nubeculosa
- 4 unidentified craneflies

One of two craneflies Limonia nubeculosa: the other four craneflies were not well-marked and remain unidentified.

(Ed Wilson)

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The Flash: 06:40 – 07:20

(109th visit of the year)

Bird notes:
- a pair of the visiting Mute Swans have departed.
- no Tufted Duck again.
- the pair of Coots with three well-grown juveniles seen again.
- only the Great Crested Grebe on the nesting platform seen.

Bird(s) noted flying over here:
- 4 Herring Gulls: all immatures
- 1 Lesser Black-backed Gull: (near?) adult

Noted on / around the water:
- 15 Canada Geese: other(s) heard from inside the island
- 3 Greylag Geese
- *5 Mute Swans: (assuming the resident pen hidden on the nest): see notes
- 22 (17♂) Mallard: almost all these were sitting on roofs
- 3 Moorhens again
- 17 + 3 (1 brood) Coots again
- 1 Great Crested Grebe

Hirundines etc. noted:
None

Warblers noted (the number in brackets refers to birds singing):
- 4 (4) Chiffchaffs
- 5 (4) Blackcaps

Notes around the area:

Moths:
- *1 Chocolate-tip Clostera curtula. moth species #8 here this year. My previous record was 08 May 22.

Flies:
- *1 possible dance fly Rhamphomyia crassirostris
- 1 midge
- *unidentified mayflies?

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

This is the immature Mute Swan, part of the visiting trio. It is still showing some grey feathering. Probably a first year bird.

From this angle this is not obviously a moth! It is a Chocolate-tip Clostera curtula.

It is only slightly better from this angle – the best I could get from its location between foliage in front of a street lamp pole. You can see the chocolate tip to the turned up tail sticking up between wings tightly rolled around the body. The furry front legs stick forward at rest.

This is possibly the dance fly Rhamphomyia crassirostris

Not sure what to make of these. Toward the top of just one of the street lamp poles where the path is adjacent to the water were at least 25 flies looking "splot" against the pole. My suggestion is that they are mayflies. But why so many in one spot is unclear.

A Long-jawed Orb-web Spider Tetragnatha sp.

(Ed Wilson)

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2013
Priorslee Lake
Great White Egret
(Ed Wilson)

2006
Priorslee Lake
2 Ruddy Ducks
(Ed Wilson)

9 May 26

Priorslee Balancing Lake and The Flash

10.0°C > 12.0°C: An early light shower. Clear for a while then a short period of mist / very low cloud before a few sunny intervals.. Light mainly northerly breeze. Mostly very good visibility.

Sunrise: 05:23 BST

* = a species photographed today
$ = a new species for me in this area

Priorslee Balancing Lake: 05:20 – 06:35 // 07:30 – 09:50

(111th visit of the year)

New bird species:
A good morning with a new bird species and a new moth species for the year:
- *an Oystercatcher was heard at 06:10 and the spent time on the south-west grass. Presumably the same bird was seen (and heard) flying East over Teece Drive c.09:35.
My bird species total for 2026 moves on to #84.

Bird notes:
- all seven Greylag Geese goslings present and correct.
- a drake Gadwall was hiding in plain sight among a group of drake Mallard.
- the same three Mallard ducklings as seen yesterday were seen again.
- an adult Lesser Black-backed Gull was the only visiting gull.
- no Grey Heron seen: possibly spooked by the presence of four police cars and two ambulances all blue-lighting in the Castle Farm Way lay-by
- more changes in the warblers:
no Sedge Warblers seen or heard
nine and perhaps ten singing Reed Warblers. Two of them are singing from well-away from any footpaths and are difficult to pinpoint where they are to avoid double-counting.
only one Garden Warbler singing and today from a dense bush adjacent to the South side of the lake. As usual unseen.
*again just one Common Whitethroat singing.
- unusual was a Skylark singing high overhead, apparently somewhere over the Ricoh grounds and audible from the Priorslee tunnel area. It could be that this is a regular songster here and it was the lack of traffic early on a Saturday morning that allowed it to be heard.
- *a group of at least four Starlings flushed off the football field: from the call-notes there was one or more fledged juvenile among them.

Bird(s) noted flying over here:
- 3 Canada Geese: a pair and a single flew East.
- 3 Herring Gulls
- 4 Lesser Black-backed Gull
- 1 Cormorant yet again
- 1 Stock Dove
- 5 Wood Pigeons

Counts from the lake area:
- 5 + 7 (1 brood) Greylag Geese: a trio arrived
- 2 Mute Swans
- *1 (1♂) Gadwall
- *8 (6♂) + 3 (1 brood) Mallard
- 11 (10♂) Tufted Duck
- 4 Moorhens
- 17 Coots
- 6 Great Crested Grebes again
- *1 Oystercatcher
- 1 Lesser Black-backed Gull: adult
- no Grey Heron

Hirundines etc. noted:
A few birds appeared when the mist and low cloud descended
- 6 Swifts
- 2 Sand Martins
- 4 Barn Swallows
- 2 House Martins

Warblers noted (the number in brackets refers to birds singing):
- 15 (14) Chiffchaffs
- no Sedge Warblers
- 9? (9?) Reed Warblers: see notes
- 15 (13) Blackcaps
- *1 (1) Common Whitethroat
- 1 (1) Garden Warbler

On the West end street lamp poles post-dawn:

Moths:
- *1 Ruby Tiger Phragmatobia fuliginosa: moth species #18 for me here this year

Noted around the area later:
The sun was still lurking behind clouds

Butterflies:
- none

Bees, wasps etc.:
- none

Hoverflies:
- *Buttercup Blacklet-type: either Cheilosia albitarsus or C. ranunculi.
- *Chequered Hoverfly Melanostoma scalare [Long-winged Duskyface]
- *Grey-spotted Boxer Platycheirus albimanus [Grey-spotted Sedgesitter or White-footed Hoverfly]

Dragon- / damsel-flies:
- none

Alder and other four-winged flies:
- *Alder Fly Sialis lutaria

Other true flies:
- dagger fly Empis tessellata
- *Yellow Dung Fly Scathophaga stercoraria
- *Tachinid fly Tachina fera
- *other unidentified flies

Bugs:
- *Dock Bug Coreus marginatus

Beetles:
- *7 Spot Ladybird Coccinella 7-punctata
- *Harlequin Ladybird Harmonia axyridis var. spectabilis
- also var. succinea

Spiders, harvestmen etc.:
- *wolf spider Pardosa sp., probably Common Wolf Spider P. pullata

New flowers for the year:
- *Goat's-beard or Jack-go-to-bed-at-noon Tragopogon pratensis minor

Other things:
- *Oak gall

Sort of dawn. Just one police car and the two ambulances remain in the lay-by as the Classic Catering van arrives.

Drake Mallard on the left and drake Gadwall on the right. A smaller, neater bird. The black stern is the most obvious feature. He seems to have lost much of his breeding finery.

The Oystercatcher has been sticking its bill in the mud!

Three shots of a fine-looking male Common Whitethroat. This is the new arrival along the South side.

The breeze ruffling his throat feathers here.

I could not decide whether he was taking the food in to a nest. I have not seen a female in the area.

The only Starling that did not flush away from the football field. The blue at the base of the bill indicates this is a male – blue for a boy and pink for a girl in this species!

This splendid-looking moth is a Ruby Tiger Phragmatobia fuliginosa. I have only logged them in July in previous years. I do not know anything about its companion.

This hoverfly is a Buttercup Blacklet-type: either Cheilosia albitarsus or C. ranunculi.

A female Chequered Hoverfly Melanostoma scalare.

A Grey-spotted Boxer hoverfly Platycheirus albimanus, also known as a Grey-spotted Sedgesitter or a White-footed Hoverfly, posing for me. And no: it is not responsible for the chunk missing from the leaf on which it is about to settle.

An Alder Fly Sialis lutaria. So far these have been nowhere near as common as in most year.

How could I resist? A female Yellow Dung Fly Scathophaga stercoraria

Another splendidly ugly fly. It is the Tachinid fly Tachina fera

I am short of time (as ever) so many of the flies I photographed today will remain unidentified. Here is one

 Another. Certainly from this angle it appears big-eyed.

Likely a Muscid fly.

A similar-looking in different lighting conditions but the thorax pattern is different.

Expect more Dock Bugs Coreus marginatus next year.

A 7 Spot Ladybird Coccinella 7-punctata. This species tends to be a deeper shade of red than any Harlequin Ladybird.

This Harlequin Ladybird Harmonia axyridis is of the less frequently encountered form spectabilis. It may have two or four spots.

When I tried to get closer(!) this wolf spider Pardosa sp. ran away. It is probably a Common Wolf Spider P. pullata though a microscopic examination is needed to confirm.

This is Goat's-beard Tragopogon pratensis minor. Its other common name, Jack-go-to-bed-at-noon, refers to its behaviour in only flowering in the morning with the petals retreating and the long sepals closing to a point.

An Oak gall. Oak trees have very many different galls, each produced by a distinct gall wasp. You need to be an expert to identify most of them.

(Ed Wilson)

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Noted in the Priorslee Avenue tunnel:

Moths:
- *1 Common Pug Eupithecia vulgata

Flies:
- 5 midges of at least two species
- *1 cranefly Limonia nubeculosa
- 1 unidentified cranefly

Another(?) Common Pug moth Eupithecia vulgata: yesterday one was on the wall; is this the same one on the ceiling?

The combination of well-marked wings and banded legs is sufficient to identify this as the cranefly Limonia nubeculosa.

(Ed Wilson)

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The Flash: 06:40 – 07:25

(108th visit of the year)

Bird notes:
- the five visiting Mute Swans remain.
- no Tufted Duck seen.
- the same(?) pair of Coots seen now with only three well-grown juveniles.

Bird(s) noted flying over here:
- 4 Herring Gulls: all immatures
- 1 Lesser Black-backed Gull: (near?) adult

Noted on / around the water:
- 18 Canada Geese: one of these arrived in the company of a Greylag Goose
- 6 Greylag Geese: of these a trio and the bird accompanying a Canada Goose arrived
- 7 Mute Swans: (assuming the resident pen hidden on the nest): see notes
- 14 (11♂) Mallard
- no Tufted Duck
- 3 Moorhens
- 17 + 3 (1 brood) Coots
- 2 Great Crested Grebes: the bird on the nesting platform looking alert today: have the eggs hatched?

Hirundines etc. noted:
None

Warblers noted (the number in brackets refers to birds singing):
- 3 (3) Chiffchaffs
- 2 (2) Blackcaps only

Notes around the area:

Fish:
- *1 Pike Esox lucius

A Blue Tit emerges from the nest box with a faecal sac. There has been no avian equivalent of Thomas Crapper and the adults have to keep the nest clean themselves.

A picture of concentration as the Song Thrush looks for food.

"Who? Me?". I suspect this is a female that had drawn a short straw. A male was singing a few feet away.

A lurking Pike Esox lucius. It was difficult to stop the camera focussing on the water surface with reflections of the trees to further confuse.

(Ed Wilson)

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2013
Priorslee Lake
Shelduck
(Ed Wilson)

2012
Priorslee Lake
Grasshopper Warbler
(John Isherwood)

2009
Nedge Hill
Whinchat
Wheatear
(John Isherwood)

2008
Priorslee Lake
Arctic Tern
(Ed Wilson)

Nedge Hill
2 Wheatear
(Ed Wilson)

2006
Priorslee Lake
2 Ruddy Ducks
(Ed Wilson)