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

Farewell winter, good (tomorrow) morning spring

A final post before the first migrants arrive and all hell breaks lose (in my dreams).

 

If the weather forecast plays out then today marks the end of this winter’s big freeze and from tomorrow positive temperatures, some rain and southerly winds will hopefully kick start the first wave of spring migration 2026.

 Winter had a final gift in the form of a big dump of snow on Sunday night and this extra snow will, I hope, ensure we get some good spring flooding that hopefully will last many weeks. I really hope that Hengsenga on Bygdøy will have flood water until at least the beginning of April as I believe there is the potential for something very good here.

I have seen some signs of spring despite the weather not yet having changed. A Wood Pigeon heading north on the early morning dog walk on Tuesday will be the first of very many and a Greylag Goose looked a bit forlorn on the ice at Østensjøvannet but today provided another two and better species. In my last post I listed three early migrants that I hoped to find soon and all had names beginning with S. After writing it I realised I could have added another S species to the list, namely Stock Dove. When visiting Bygdøy today hoping to find the first Oystercatcher of the year I stopped off to see if any Stock Doves had returned to their usual spot and sure enough one was sat atop a usual tree which is Oslo’s first in 2026. Huk didn’t have an Oystercatcher yet but a flock of 8 Twite flying over were also Oslo’s first of the year but rather than being migrants may be birds that have wintered on islands close by taking a bit of a fly about. 17 Guillemot on a flat sea was a notably high count for the time of the year but I couldn’t find any divers or grebes which should soon appear.

 

I am really looking forward to the coming week and have high hopes for both Bygdøy and Østensjøvannet but think Maridalen may have to wait a bit longer as there is still so much snow.

a total of 4 Little Grebes (dvergdykker) at Kongshavn on Saturday. This is a joint highest count for Oslo and I would love to know where these birds breed

they acted as though they were two pairs and called a bit but are not yet in summer plumage

Østensjøvannets female Pintail (stjertand) now with bling

Pygmy Owl (spurveugle) in Maridalen on Sunday

Greylag Goose (grågås) at Østensjøvannet on Monday

my first Lesser Spotted Woodpecker (dvergspett) of the year. It was not drumming or "singing" but gave itself away through its weak tapping

Maridalen at its wintery finest

distant Pygmy Owl on Tuesday

and much closer

here, it had just visited the old woodpecker hole which I photographed it in in my last post and flew out with this mouse! I have assumed that this particular bird is living off its larder at the moment as when I see it in tree tops it is just looking as though it is enjoying the view rather than hunting

The first Greylags at Bygdøy Kongsgården but I bet that in a weeks time there will be triple figures here and hopefully with some smaller, scarcer cousins in their midst

Oslo's first Stock Dove (skogdue) of the year

Water Rail (vannrikse) still going strong at Østensjøvannet

and Jacky Boy is also still going strong. The upcoming thaw will be good news for them but will also, I fear, make them more difficult to find

Three weeks in

This week hasn’t been so cold with temperatures around zero or just below but it has also been cloudy meaning it is dull whilst out birding and at night we have missed the fantastic show of Northern Lights that many others, and not least Jr in Tromsø, have seen.

The Pygmy Owl has been quite easy to find every day except of course on Saturday when I was guiding. It often sits high and exposed before suddenly disappearing into woodland where it can then disappear for a couple of hours before popping up on a tree top again. I believe it is now eating the rodents and birds that it spent the autumn storing in nest boxes and old woodpecker holes and is catching little new food although I have seen it clearly looking for rodents. Water Rails have also showed well including a bird feeding very out in the open and Jack Snipe have bobbed away for Norway but bird, if not photo, of the week goes to a Greylag Goose flying north over Maridalen on Thursday. Quite where it thought it was going is a mystery to me and whilst it is the only Greylag reported in Oslo this winter I was a bit surprised that when I did see an anser goose that it was not a Tundra Bean or White-front a few of which have turned up further south as a result of cold weather movements around the North Sea.

After having seen footprints and droppings in the snow for a few days it was also nice to see my first Moose of the winter in Maridalen. If the cold weather continues and especially if we get more snow then Moose should become quite reliable in the Dale.

Pygmy Owl (spurveugle) on Tuesday

changing angle - attempts at arty photos..

this female Teal (krikkand) is hanging out with the Mallards (stokkand) at Østensjøvannet but remains shy and doesn't come to bread so I wonder what she does eat

the Pygmy Owl on Wednesday

Water Rail feeding in the open

bird of the week - a Greylag (grågås) heading north

Moose

And there will be lots more of this in a later post:

Geese, geese, geese

I have been drawn back to Nordre Øyeren daily now in the hope of uncovering something rare. The numbers of geese are just enormous and you can see them either feeding on stubble fields or resting on the water at Svellet. There are at least 2000 each of Barnacles and Greylags but probably a lot more as well as 400 Canadas. Finding something scarcer amongst all these has proved tough going but I have now found a single White-fronted Goose, single Bar-headed, single Pink-footed and 3 Greylag x Canada hybrids. I have only found one bird with with a collar - a Greylag ringed in Germany in 2021 and since either close to Oslo or in Germany.

I have spent too long looking at the Canadas and have got a headache at the amount on variability amongst them with some birds definitely looking «wilder» than others but all probably within the variation of size and plumage of a feral population that probably has little genetic diversity.

 

White-fronted Goose (tundragås)

Bar-headed Goose (stripegås)

neck collared Greylag (grågås) D780 and its history below

this Canada looked very interesting from afar 

but closer up I wasn't s sure

and this one while not being so dark also looked quite different

enormous numbers

Water levels have risen a lot due to heavy rain and there is no longer mud in Svellet so waders and dabbling ducks have vanished but there are now 4 Little Gulls and also 4 «commic» Terns (I remember as a child hearing the term Commic Tern and not being able to find it in my bird book. It caused me lots of confusion for a long time until I finally plucked up the courage to ask an older birder what it was and found out it was from COMMon and ArctIC and referred to unidentified birds of the species pair. I also remember very soon after calling out “Commic Tern” and it being a white dove….). I initially thought there were 2 Common and 2 Arctic but with better views have now come to the conclusion that there are at least 3 Common and the fourth bird is also most likely a Common. It has been quite a learning experience where I relied too much on jizz and behaviour to start with.

a commic tern and 2 Little Gulls (dvergmåke)

3 f the 4 Little Gulls. All were 1cy

this 1cy tern with grey secondaries must be a Common (makrellterne)

I have had 10 species of raptor which is a good showing and my first Great Grey Shrike of the autumn.

my first Great Gre Shrike (varlser) of the autumn which I saw eating a mouse

a very distant, but very smart, male Hen Harrier (myrhauk)

Peregrine (vandrefalk) and a pale Common Buzzard (musvåk)

this immature White-tailed Eagle (havørn) flew over Svellet

and a bit later I found it on a field that had previously been covered in geese with just a few crows for company

Merlin (dvergalk)

I have also had a couple of attempts to locate the Taiga Beans but have failed. I assume they are still around as it would be record early if they have already left and I remember that in previous years the GPS tagged bird(s) have shown they have often used one particular field that is very well hidden and that I have never tried to get to as I am certain it will just result in flushing the birds – they may well be using it again.

 

I have only had a couple of quick visits to Maridalen but a perched and then hunting White-tailed Eagle was a very good sighting.

the Crane (trane) family is still feeding in Maridalen

it is very unusual to find a perched White-tailed Eagle in the Dale