tom swift among the diamond makers

 cowbirds get their name because they follow bison and cows. and they eat the parasites off them they are also called um I forgot their name. but they also will find another bird's nest and lay their own eggs. which of course are much bigger so when they hatch they kill the actual birds and they leave themselves there to eat as much as they possibly can. and have the mom working overtime to find worms for them. all the fully grown ones will actually eat the other bird's eggs and they also eat snails and other things. the birds are very deceitful.