Honey Buzzard nest 2025

I have this year spent little time with the Oslo Honey Buzzard nest that we first discovered in 2023 so this post will be shorter than in 2023 or 2024 but still interesting I hope and every year is different. I have had a couple of updates already but will with this post try to summarize the whole season.

Stig Johan was the first to visit the nest and on 9^th June saw fresh spruce branches had been placed on the nest but no birds were seen. I visited on 11^th and spent 2 hours in the area without seeing any birds.

the empty nest on 11th June but with fresh spruce branches placed on it

On the 14^th Stig saw the female was on the nest and it looks like the nest is at least 10 days ahead of last year.

I visited on 15^th and also saw the female on the nest but did not hang around.

the female incubating on 15th June

We then had no more visits until 20^th July when Stig saw the female standing in the nest suggesting the young had hatched. On 28^th I saw the white fluffy head of one small young and suspected the female was brooding another.

the female was sitting high up in the nest on 28th June and I glimpsed the white head of a small youngster

1^st August the male was on the nest with two young visible. I had a long session at the nest with nothing interesting happening apart from a fox, runner and mushroom picker that all passed between me and the nest until after a wait of 5 hours the female turned up but did not visit the nest after having clearly seen me (I left shortly afterwards to avoid my presence affecting their behaviour).

male with both young visible 1st August

Next visit was on 14^th August and by now the young were alone on the nest. No adults visited in the 2 hours I was at nest. Looking over the nest area later two visiting Honey Buzzards (both quite dark birds) circled high over the nest and disappeared from sight before the nesting male appeared out of forest and also thermalled out of sight.

the 2 young on 14th August. The difference in age/development is clear

the two (a pair?) visiting birds that thermalled over the nest

A visit on 16^th revealed one food delivery from male.

the older youngster wing stretching on 16th August

and the younger bird

the older bird on the nest

On 18^th the male came with food 3 times with around half an hour between each visit so had obviously found a wasps nest fairly close by. I noted that there was a clear difference in the development of the two young with the oldest having pretty much fully developed flight feathers whereas the youngest still had sheathed feathers.

the oldest young on 18th August

the development difference between the 2 is clear with the younger bird still having white downy feathers on its head

the older bird wing flapping. The flight feathers are almost fully grown

a new watch point where I was able to position the (remote controlled) camera closer to the nest whilst I used an upended tree trunk as a hide

On 20^th I witnessed the male come with food twice with exactly an hour between visits. The male called for the first time after leaving the nest and presumably having seen me (he never calls before delivering the food). Viewing the nest area from a distance I saw a dark bird (presumably one of the two birds seen on the 14^th) sky dancing over the nest area without being intercepted by the breeding male (I assume the female has, as in previous year, already left).

the youngest bird has nearly lost its downy feathers and resembles how the older bird looked 4 days previously on 16th August

dad coming in with food

on the nest for the second food delivery

Honey Buzzards do not have the same strong talons of other birds of prey as they do not use them to catch prey in the same way

viewing from the other side of the nest. Here the youngest bird is visible and some wasp comb can be seen on the edge of the nest

the older young

a dark visiting bird that sky danced over the nest area, presumably one of the two birds seen on 1st August and meaning they must have been resident in the area

a piece of wasp comb under the nest

there was not much wasp comb on the ground meaning the nest is probably full of the stuff as well as droppings so must be quite unpleasant

On 25^th the oldest was doing some serious wing flapping and was jumping onto branches by nest. The male visited once with food and again called after it left the nest (had clearly seen me).

In this video both young can be seen wing flapping and the difference between their development is easy to see with the younger birds flight feathers still not fully grown.

the younger bird with just a faint trace of down left on its head

those chicken legs

the older bird. Both young are quite pale although they can be paler. In 2024 one of the young had a similar plumage although the other was a bit darker and in 2023 both were similar to this years birds

the older bird I think

My last visit was on 28^th. I was surprised that both young were on the nest when I arrived. The male came with food and upon leaving (and having seen me) called from around the nest area both in flight and also while perched for 10 minutes before he drifted off. The largest youngster then flew very strongly off nest and away through forest. I think that the calling when the young have reached fledging age is to warn them that they may have to flee the nest to avoid danger. There is not point in calling like this when they cannot fly as it will only draw a predator attention to the nest without the young being able to escape.

the older bird I think

the older bird shortly before he flew off

the younger bird remaining on the nest

what must be dad seen flying past the nest area later on

I did not visit again but based on flight feather development I reckon the youngest bird would have needed another 3 days or so before it could also fly off the nest.

The first sighting of a fledged juvenile on 28^th August compares with 10^th September in 2024 (a very late year), 7th September in 2023 and for the different pair on a close by nest in 2021 of 31^st August. I would say that this year’s fledging date is a typical date for a Norwegian nest whereas the last two years have been particularly late.