Some eastern populations of the Cooper's Hawk declined significantly in the mid-1900's, probably due to shooting, trapping and pesticide contamination. Although they are still designated as Endangered or Threatened in several eastern states, recent evidence suggests that breeding populations have recovered in many areas. The largest bird is the ostrich. Hummingbirds lay the smallest birds' eggs. They always lay 2 at a time, each the size of a person's small fingernail.
All modern birds have beaks and feathers.
Birds have been the subjects of many works of art. Read about birds in a nursery rhyme.