I have now added observations by Mercutio, Damien Evans, Kestrel, and Fiona, as well as updated the observation dates on some earlier observations.
It might have been a juvenile, but I think there were several, and I'd have said their calls were less hoarse than the usual. Higher, longer, and somehwat more tonal. None of the sounds I found quite match.
I suppose there could be individual or regional variation, but I've never heard of that in crows. Those are the only species occurring in your area, so perhaps locally and vocally aberrant ones is the only solution?
No contributions from me for a couple of weeks, the reason being that it is midwinter and the last two sundays, my only day off, have been overcast wet and cold.
It's been too hot (high today was 38 C) to go birding on the Colorado plains
For one, it's to cold and for another it's too hot^^.
I blame paperwork, instead. I am filling out permit applications for my trip to Australia, and that takes a lot of work. I'll have to call them late tonight (my time) to ask for help, because they're not responding to emails. It would be a bit of a downer if I went to all the trouble of arranging my trip and buying tickets and so on, only to be denied to do any actual collections, so I try to make everything correct from the start.
I haven't done well lately. I was in Amsterdam on the 19th July and I only saw:
Which is a healthy injection to the Dutch list, previously consisting only of Nightingale. A few comments:
Judging by distribution, I believe your Treecreeper must have been a Short-toed one. I don't have any good books on European birds here at work (and my supervisor's office is closed, as he's not in today), but according to the Wikipedia maps, it seems only the Short-toed lives in the Netherlands. I have preliminarily added it as such, but would appreciate input from others on this.
The parakeet I would guess is Ring-necked Parakeet
Psittacula krameri, as that is the only one I know that has large populations in Europe. Does this seem to fit?
As to the heron: it wasn't a young Grey heron, was it? They can look strange at times. Otherwise my only guess would be Purple Heron, but I have no experience of that one, so I don't know what it would look like in juvenile plumage.
Also: there have been a lot of very nice pictures here recently. Thank you all! Now that Kestrel has taught me how to edit my pictures a bit, and EHocking is back home, I will be sending him a lot of them^^.