They are also the only group of birds able to fly backwards.

This large family is often further subdivided into groups of similar birds.

They are a very territorial group of birds; however sometimes only during breeding season.

A group of birds then came from a nearby lake and ate the barley.

One day, Scales goes to chase a group of birds flying in the sky.

They are not closely related to other groups of birds.

I've seen small groups of birds behave in such a fashion for the past week or two.

They are among the most sexually dimorphic groups of birds.

Morphological differences between the two groups of birds are in fact plentiful.