Brown-headed cowbirds are common across all of North America.
They do not build their own nests and are considered to be a “brood parasite.”
A female cowbird will scope out a nest beloning to another species of bird.
Cowbirds are able to spread a number of different diseases through their droppings.
Because of their aggressive behavior, cowbirds are unfortunately known to live almost 16 years in the wild.
They typically feed on insects like beetles and grasshoppers as well as seeds from grasses and weeds.
The evidence points unmistakably to the view that the Cowbirds originally bred in normal fashion and that parasitism is a secondarily acquired habit.