> Some birds learn to recognize their own eggs. If they come home and find a foreign egg in their nest, they will dump that egg onto the ground.
It can also works the other way round. Remove an albatross chick from its nest and the parent doesn't recognise them and the chick will starve https://www.dailymail.co.uk/news/article-7619547/Fans-Sir-Da...
Nature eh?
(Apologies for the Daily Mail link)