This conversation crops up a lot on the various forums for chicken owners on the internet. Several lines of chicken feed (such as Purina's Layena Sun Fresh
) are labeled "No Animal Protein" or "Protein From Vegetarian Sources." Then again, most consumers have also seen eggs and chickens labeled "Vegetarian Fed."
The odd thing is, chickens are not vegetarians. Chickens are omnivorous, and when left to their own devices will eat a diet of about 80% plants and 20% insects and small animals. (Yes, chickens will eat mice, lizards, small snakes - basically anything that they can catch. You did know that chickens evolved from tyrannosaurus rex, didn't you? Now you can see the resemblance!)