National Geographic : 1934 Jul
BIRDS IN GLOSSY BLACK AND VIVID COLOR SINational ureograpnic society A SOCIAL PARASITE AND A BIGAMIST Too lazy to build nests or rear their own young, the eastern cowbirds (upper pair) play a tragic r61e in the lives of smaller birds. The female (right) has sneaked one of her large speckled eggs into a chipping sparrow's nest. Unless the foster mother builds a floor over the unwelcome present or ejects it, she will rear a ravenous cowbird almost twice her size, while her own young may be crowded out, or starved. The eastern meadowlark (lower, and flying), sweet songster of our daisy fields, has induced more than one female to become his wife, but normally he is monogamous.