The Cow Bird, like the Cuckoo, lays its eggs in other birds' nests. The baby Cow Birds often grow larger than their nest mates and kick them out. The mother birds will nurture the intruder nevertheless. I once photographed a mother Gnatcatcher feeding a baby Cow Bird much bigger than herself. Can you imagine keeping a voracious dependent content on a diet of gnats? Cow Birds are not to be confused with Bronzed Grackles, which have similar colors, but reversed on body and head. See below.