Succesfull breeding

Some pleasant surprises in Oslo and Maridalen regarding breeding birds means I am not completely over into the butterfly world just yet.

On the lake there was suddenly a single adult Mute Swan with 5 small young! This is just like last year in that they suddenly appeared but this year I was better prepared and had discovered the nest on 26 May. After that discovery of the nest though I had been unable on subsequent attempts to see any birds on it (although it was very difficult to see) and had only a record of single adult on 1 June and then a pair flying over the lake (not near the nest) on 9 June. I therefore assumed that the nesting attempt had failed and the birds had moved off. To suddenly see an adult with young was therefore a shock and it was equally surprising that I could not find the other adult anywhere on the lake. Has the male died or moved off? And if so how did the female managed to incubate and feed without me ever seeing her? And the pair I saw on x June – were they visitors? Perhaps the other pair that started nesting and then gave up? An answer to the first question is that P578 who I saw on Maridalsvannet on 29 April, and his ring was again read on 24 May, who is the male of the pair that bred last year and I assume the father of this years young was seen on 16 June at Fornebu where he and his mate had spent the winter – so it looks like he has left his mate to fend for herself! Did this happen before the eggs hatched?

Mute Swan (knoppsvane) - presumably female PC79 who bred here last year - with 5 small young but not with her mate (P578) who has flown down to Fornebu!

The Black-throated Diver pair (one of perhaps two on the lake) still have a single youngster and have moved quite a way from the nest with it.

Black-throated Diver (storlom) family

The ever growing cereal crop on the Lapwing field makes seeing the birds very difficult but yesterday I could see 3 (2 + 1) almost fully grown young which is a great relief but the fate of the two last nests remains unknown.

a nearly fully grown Lapwing (vipe) young

And finally, I had Red-backed Shrike in the Dale this year and it seems to be a nesting pair so fingers crossed for their success.

pair of Red-backed Shrikes (tornskate) in Maridalen

and the male on his own

A visit to Østensjøvannet today also revealed lots of young birds. Best of all were the Black-headed Gulls which have had their first successful breeding season (at least as a colony) for a few years with many large young on two islands. Great Crested Grebes, Coot and Mute Swans also had young (the later no larger than the ones I saw on Maridalsvannet) and surprisingly a female Goldeneye had 11 quite large young with her. This raises two questions – are they all hers? Perhaps unlikely. And how have so many survived so long? Normally the vast majority get eaten either by gulls or pike.

Black-headed Gulls (hettemåke) have had a successful breeding season at Østensjøvannet

and a male Gadwall (snadderand) which once again seems to have chosen Østensjøvannet to moult although this year there were no records earlier in the spring

Memories

I’ve long been itching for a seagaze. It didn’t need to be a particularly good one just as long as there were a steady passage of birds. Over 10 years ago I had for a few years the habit of driving the hour to Brentetangen, just south of Moss in Østfold and seawatching from there before visiting nearby Kurefjorden. I cut some of my Norwegian birding teeth doing this and had some good birds and company doing so. Brentetangen used to attract quite a gang on good days but these days seems to get little attention. Serious birders are become a scarce species not just in Oslo but it would seem all over Norway.

I’d been looking at Windy.com for a few days and had highish hopes that yesterday would deliver some north bound passage over the sea. After a long period of northerly winds they were finally going to swing south on Thursday afternoon so by Friday there should be loads of birds. The winds did not end up being quite so southerly as initially forecast and it was quite cold but I still think that I should have seen more than I did which in terms of migration was pretty much nothing. Gannet and Kittiwake were good birds for me and are both species that usually need a real southern storm to end up Akershus waters but just 20km further south are fairly regular no matter the weather.

the view from Brentetangen looking 10km across the fjord to Vestfold

 

Kurefjorden was also disappointing with 18 Dunlin being the only calidris waders although I was sure I heard a BbS.

and Kurefjorden. I was expecting waders to be dropping out of the skies

 

Question now is how many years will it be before I try the Østfold combo again?

 

Thursday was another of those religious public holidays that Norway loves «celebrating» but for which 90% of the population have no idea why - it was of course Ascension Day and if you also don’t know what that represents then I recommend Google…

The winds may have been from the north in the morning but finally it was raining and the clouds heavy and low. Surely this would draw all the remaining serious Oslo birders out of their warm beds? Fat chance but as there seemed to be little to find maybe they were just birding smart.

I decided to keep it local. Maridalen early doors was just wet but Østensjøvannet had ca.300 Swallows and martins. I promise I looked at every single one but a red rump was not to be seen. Such a large congregation was a joy to see as the last couple of years have not seen scenes like this and means the lake again must have good numbers of insects.

just a small fraction of the Swallows (låvesvale) and a single Sand Martin (sandsvale)

Back in the Dale around 11am there was a very brief period when the rain stopped and waders flew over: a flock of Wood Sands, a couple of Greenshank, 3 Whimbrel then 160 Golden Plovers. And then it was over.

most of the Golden Plover flock (heilo)

I allowed Jr Jr to have some driving practice and drive me to Svellet but despite water levels not having risen and rain having fallen there were hardly any waders. This is strange given the passage I had over Maridalen and also a fall of arctic bound waders reported at Øra but I have noted this before that when other places experience fall like numbers of waders that Svellet can be nearly empty of birds.

 

Maridalen has had some exceptional days in late April and May always when there is rain and heavy, low cloud but they are not happening with the regularity I remember although I am sure that they didn’t happen quite as much as rose tinted memory tells me. Looking at the numbers it is actually seven years since the last big day which was 10th May 2019 but that will perhaps be a day never to be repeated.

 

This morning’s pre breakfast Maridalen visit was no less uninspiring that the last few days except for one bird that was totally not on my radar - a Taiga Bean Goose. This was my first record in the Dale although there is a previous record (but I remember seeing that bird and choosing not to put it on my list as such).

I finally found nesting Black Woodpeckers although they were still excavating which is very late. Three Great Spots were also drumming which again is late - both these species should be on eggs by now. Two Wryneck singing in the same area were to be more expected at this time of the year but no less exciting for that.

I nearly didn't pay these geese any attention but with the nakes eye thought that the bird second left looked a bit like a young White-fronted Goose (tundragås) one of which was found yesterday at Østensjøvannet. Through the bins it proved to be a Greylag but I continued looking at the other geese and the one of the top was a Taiga Bean!!

here the head and bill shape leave me in no doubt

just based on this picture though I am sure you could rgue for both Tundra and Taiga although I think the bill shape can only match Taiga and the extensive orange is also a very pro Taiga feature

It was also a large bird with a swan like stature

I would not say this bird is a classic Taiga but believe that most features are pro Taiga. I also must say that I do hate single Bean Geese and it would be much more convenient if the two species were lumped again

in the river it was also upending which I also view as pro Taiga

I had been hearing Black Woodpeckers (svartspett) and was sure they were nesting so went looking for a suitable tree and hole. These huge splinters on the road! gave away where they were.

Loads of birds!

I frequently am accused of being overly optimistic in my bird forecasts and expectations but I see that my predictions in my last post for Svellet were actually very pessimistic. The wader fest is far from over as the water levels have stopped climbing (at least for now) and there clearly is enough food available as wader numbers which fell on Wednesday rose sharply yesterday (when I did not visit) and were still high today. Viewing conditions are far from great which is par for the course there but today I was able to pick out a Temminck’s Stint although another one on nearby Merkja was much easier to view (as were two yesterday evening which I twitched at Fornebu).

Yesterday gave me a non-wader mass bird event and a quite unique one at that. Very large numbers of Willow Warblers have been seen crossing the fjord from Nesodden and they have been then concentrating at Østensjøvannet. It would appear that frost nights to the north (temperatures were under zero on Tuesday evening as we drove home form owling) are stopping the nocturnal migration of the Willow Warblers and they seem to be stopping their northward journey in the Oslo area and then continuing northwards during the day and moving whilst also searching for food. There is not an overabundance of insects yet in Oslo but Østensjøvannet clearly has good numbers. There were over 1000 Willow Warblers as I walked around the lake and every tree and bush was dripping with them. They were also feeding in long grass, on the short grass of playing fields, on a newly ploughed field, on the paths and many were sallying after insects in the manner of a flycatcher from any available perch including fence wires. It truly was an amazing experience both visually and orally as birds were also singing everywhere. There were not many other species that had clearly arrived with the WWs except for Blackcaps which were more common that normal but not in exceptional numbers. That there were lots of insects to eat though was shown by House Sparrows that were flycatching and Bramblings taking insects alongside the WWs in bushes.

This video gives some idea of how it was but does not pay the experience the justice it deserves:

Svellet 8th May as viewed from the eastern shore

and viewed from the west - still lots of mud and shallow water which clearly has more food than I expected after the water levels rose so quickly

A really heart warming sight at Østensjøvannet are the Black-headed Gulls (hettemåke) that are nesting again. There are three small colonies (including this one) and scattered single nests around the lake and the total number of nests may not be much more than 50 but this is in stark contrast to last years dire situation but also the 2000 odd pairs that used to breed here. Fingers crossed that there are lots of fledged young in a month or two. There is also a good colony at Sognsvann - it would appear that the two most visited lakes for recreational use are attractive to both humans and gulls - but I have yet to notice any nesting on the fjord so I fear that overall things are not good for the species

yesterday and today I could not see a single young Lapwing (vipe) in Maridalen but there is a new nest although as this field was only ploughed on Sunday I am not sure whether she is incubating or just in the egg laying phase

and the Mute Swans (knoppsvane) are now finished with nest building and are on the nest although I do not know whether any eggs have been layed yet

The annual early spring outing to Gressholmen

Yesterday saw me watching some big owls very well in Hedmark and I will come back to them in a day or so but first an update from a good days birding in Oslo.

Every spring the car needs its service and I use this carless day to go out to the islands and today was that day. I only visited Gressholmen but it was a good trip even though it is still way too early for anything that exciting. However 3 Slavonian Grebes at close range were, as always, a treat and they even displayed a bit. These, a Green Sandpiper and a Great Grey Shrike which even sang a bit were all Oslo’s first records of the year..

After this a trip to Middelalderparken failed to reveal anything rare among the few hundred gulls bathing there (although turnover is clearly high so things can always turn up). A very pale mantled Lesser Black-back and a yellow-legged and slightly dark mantled Herring Gull got some attention. I also managed to fit in a trip to Østensjøvannet before the car was ready to be picked up and thankfully didn’t need any additional work doing to it.

Slavonian Grebe (horndykker) pair

This video has lots of display and interaction between the birds

And this short extract shows some interesting display with what seems to be the unpaired bird trying its luck before being chased off. Note how it dives under water and then starts penguin displaying which gets a positive response from the other bird before its mate turns up

look at the reflection of the black head feathers

all 3 birds which were a pair and I believe a male

the pair of Smew (lappfiskand) still at Østensjøvannet

the yellow-legged Herring Gull that isn't a Yellow-legged Gull...

this pale backed Lesser-black Backed Gull (sildemåke) is ringed and its life history and other pictures suggest is an intermedius with some pigment problems (note that the primaries are not black) rather than a graellsii

Great Grey Shrike (varlser). It was intently staring at the ground in an area with lots of Water Vole holes but I did not see it catch one which would also have been a large prey item

I only discovered this Greylag Goose nest when it hissed at me as I almost stood on it

this young Herring Gull looks to have got some paint on it

there were 6 Ringed Plovers (sandlo) on Gressholmen which probably represent the entire Oslo breeding population

And a video of a drumming female Lesser Spotted Woodpecker from earlier in the week

A week gone by

As I write this it is just +1C and snowing outside the window. This is in stark contrast to England where Jr and I spent a loooong weekend looking at flowering daffodils, bluebells, wood anemones, Firecrests and Red Kites. Firecrests have now become ten a penny in my childhood birding haunts where I definitely did not see a single one (40 years ago….) when I was a young birder and Red Kites now cruise over urban areas looking for a snack. In contrast to these species that have become much commoner I also heard a Lesser Spotted Woodpecker which would appear to be the first eBird record for West Sussex this year. It was a rare species when I was a lad but has clearly become even rarer in the (may) intervening years.

Before we went to England Maridalsvannet was still frozen and Østensjøvannet still half so. Now Maridalsvannet and, I presume, ØV are ice free but surprisingly Sognsvann proved to still be covered in ice on a walk with The Beast today. We are still waiting for the big arrival of thrushes but lots of Chaffinches have arrived although we are still waiting for the big arrival of Bramblings. Yesterday was a good day for Pink-footed Geese with 3000 or so passing over Maridalen in just an hour of observation but there did not seem to be anything else moving. Maybe I will still get big raptor da

Mute Swan (knoppsvane) pair on Maridalsvannet. I have not seen them getting any grief from the Whooper Swans so may be there will be far less swan drama this year although I still think the lake is a very suboptimal locality for them. Both birds had colour rings although I was unable to read them

Pink-footed Geese (kortnebbgås) heading north over Jr in Maridalen yesterday

a lone Pink-foot with Greylags by a frozen Sognsvann today

a large flock of Pink-feet over Nes in Maridalen

a pair of Smew (lappfiskand) at Østensjøvannet before we went to England. It has now become an expected event that the species will turn up as soon as the ice starts melting there

another species that has appeared in Sussex since I left is Egyptian Goose (niland) which still breeds during the southern summer, i.e our winter

Goshawk (hønsehauk) nest at Sognsvann today. This pair must surely be the most accepting of humans in the whole of Norway

me scoping an ice free Maridalsvannet yesterday

Forced to twitch to get a feeling of spring

The progression of spring has not met my always high expectations. Lots of fog and temperatures only just over zero seem to be holding birds back with ice still on all water other than some streams and rivers, snow still covering most fields and the chance of a large spring flood seeming to be reduced.

Trips to the Glomma and Aurskog-Høland have revealed lots of Whooper Swans which are definitely on the move but there are not may other waterfowl moving yet. If the main flock of Taiga Beans have arrived then they are hiding themselves very well and I have only found four on two visits with one pair flying around calling and clearly not managing to find any kin. I have managed to twitch a Bewick’s Swan and a flock of White-fronted Geese but have not found my bird finding boots so far this year and a visit to a foggy Østensjøvannet today resulted in me twitching others finds in the terms of a male Stonechat and a nice adult Rook.

Maridalen is just white with ice, snow and fog and there is no evidence of spring migrants other than three Whooper Swans which are back. The bird I feel is most notably missing so far this spring is Mistle Thrush which was a very absentee on trips out east. I assume there is some cold weather further south that is holding them, and a number of other species, back.

Bewick's Swan (dvergsavne). This is the only bird to be seen in Norway so far this year and is a species that I think is a good candidate to become a national rarity not so much as it is difficult to identify but more because it has now become a genuinely rare species in the country. Many records now are, such as this one, of birds mixed up with spring flocks of Whooper Swans and turn up in similar areas each spring suggesting they are returning birds. This one is in the same area as a pair in 2023 and upto three birds last year. I should look at the bill markings to see if it is a bird from a previous year.

The bird was found on Friday amongst 300 Whoopers. I had been there on Thursday when there were only 130 Whoopers and despite it being top of mind did not see anything smaller amongst them.

Lapwings (vipe) have not come to Maridalen or fields by Glomma but there was a big concentration by Hellesjøvannet yesterday with 70 birds considered a very high count nowadays

a pair of Taiga Beans. There was another pair about 50m away but no big flock yet. I wonder if the 12 I had last week were part of the regular flock or perhaps from another population and were just passing through.

White-fronted Geese (tundragås) with Greylags and Canada Geese. The flapping bird has particularly impressive belly barring

there are 10 White-fronts in this shot

today's Rook (kornkråke) with a Hooded Crow (kråke) at Østensjøvannet. A number of records in the Oslo area in the last few days show that the very small spring passage of the species is occuring now

and a nice male Stonechat (svartstrupe) which was in exactly the same area as a bird 3 years ago

these large hairy caterpillars seem to be a very important part of the diet of the early returning Stonchats. That no other insect eating species seem to feed on them quite so much makes me wonder if they are a poisonous species and only Stonechats have developed the ability to eat them