Thus, they are unable to outmaneuver the crows and more vulnerable to mobbing. A crow either knows this fact intuitively or it learns its lesson only once. No other bird earns such high marks. When not scolding some bird, crows spend much of their time searching for food. As a species, the crow will eat almost anything from carrion to insects and fruit.
Individuals develop diet preferences and select certain foods over others.
Most crows will take eggs and nestlings when they find them. They will also take small lizards, snakes, and rodents. Bluebirds are mostly immune to blue jays, because their eggs and young are in cavities or nest boxes. Blue jays bully other birds but not always with predatory intent. Blue jays also possess a repertoire basic to their species.