Last night we watched another fascinating episode in PBS's Nature series hosted by David Attenborough. This one was about bird eggs, the variety of their characteristics, and the birds that make them. For example, the cuckoo doesn't make its own nest and hatch its eggs. It lays the egg in the nest of another bird -- a different species and mimicking the color and shape of its eggs -- and that bird hatches it (if successful).
Nothing was said about how the host behaves after the cuckoo egg hatches. Per Wikipedia, the cuckoo chick is much larger than a chick of the host species, but the host doesn't discriminate against a cuckoo chick. The host feeds a cuckoo chick as if it were the host's own.
The entire episode can be viewed online until May 8 here.