What about Emporer penguins then? The female comes back with food after a few months to take over looking after the chick and relieving the male and they still find them, even though
1) Penguins look very similar
2) They are all in a big bunch
3) It's howling a gale
4) It's probably dark.
Amazing birds.
Uh, you only REaffirmed the argument. That is Emperor Penguins can tell apart other Emperor Penguins but oddly enough, you can't. Probably because you aren't one.
But if you are, damn, you are one amazing bird.