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It would seem a bird walked on the concrete while it was still wet. Wouldn't the concrete also have stuck to the bird's feet, hampering it?
Sure, thins is if that concrete is “wet” enough for a bird to leave those prints, it will easily wash off. Birds thump around in mud and much all the time, the bird will wash it off.
Sure, recently mixed concrete is basically just wet powder with sand and gravel. The powder will absolutely stick. Hypothetically, if the bird then flies around long enough for it to dry, the bird will probably get itchy feet, but the concrete will dry and flake away fairly quickly.
If you have thin bird skin, I wonder if it could actually cause a nasty burn.
Hypothetically yes.
Concrete has a very high PH, between 12 and 13, it can even test at almost 14, depending on admixtures , letting that sit on on skin can cause concrete burns.
Its less about how thick the skin is and more about the normal conditions the legs are in, and how resistant those legs are. Seabird legs are going to be adapted for a higher ph than humans, and probably be more resistant to a high ph than people, but a ph of 13 or 13.5 is dangerous to any living animal, except perhaps an extremophile
Not enough to cause any problems. Even if it's on their feet long enough to dry, it'll be a thin skin of the more liquid components of concrete. Think slightly harder dried mud. It'll just crack and flake off or rinse off in the rain.
No hampering.
Think how light a bird is, maybe 20 gram. It does not sink deep into it. Concrete is astonishingly heavy, so, even when still wet it carries a lot.
Probably, yes?