Australian Breeders MarketThe American Cowbird
The American Tri-City News has an interesting article on the American Cowbird and its breeding habits.
The Cowbird (originally attracted to bison, but now to the more common domestic cattle) adapts to its migratory habits by laying its eggs in the nests of other birds, leaving the other species to raise the baby, similar to cuckoo behaviour.
The columnist touches on an interesting point about the changing behaviour of the cowbirds, with some sighting of adults feeding young cowbirds. The theory is that now that cattle are more sedentary, as opposed to the migrating bison, the adult cowbirds no long need to be on the move and can rear their own young.
An interesting topic, and I would be interested if someone knows more about it.