You've probably heard of invasive plants, but what about invasive birds? These common nonnative species are now abundant in ...

Multicolored birds were developed over centuries of near domestication. Polytypic (12 ssp.; nominate in North ... iridescence on the neck and breast; iris orange to red; orbital skin blue-gray ...

This is the common and familiar “sea­gull” across much of North America ... red orbital ring; yellow legs and bill; bill with a clean-cut black subterminal ring. Winter adult: head and neck ...