Birds can remain partly conscious during sleep because of this.

Female is dominant

This must exist for an effective organization to exist in a population that maintains social groups.

Members of this group of vertebrates are known to bring food to their young.

Greatly reducing body temperature and metabolism for a prolonged period, especially during winter.

Individuals have different roles in a group.

Male is dominant

A chemical signal that influences the behavior of another.

New Caledonian crows might use these to search for insects.

Hibernation is rare among this group of vertebrates.

Individuals will chase away a predator.

Have access to better food in a group

Young birds are sensitive to the song of their species.

This is the main ecological factor favoring cannibalism.

This is a state of dormancy during periods of great environmental stress, often without greatly reducing the metabolism.

Expected eye to be open when sleeping for a bird in the center position of a group.

Aggression that rarely results in injury.

Bats are the only mammals known to use this as the principal means of locating prey.

This group of vertebrates have been known to use twigs and sticks to attract nest-building birds, which they then eat.

A hibernaculum is what these types of terrestrial vertebrates seek out to survive the winter.

Helps an individual in a group when a predator attacks.

Elephants have been shown to have higher fitness when they possess this.

Vision is important in mammals because of this quality of the head.

In mammals with highly social societies, feeding is a _____ activity.

Will have dormant periods during winter, but the body temperature may not reduce very much and/or the metabolism doesn't reduce very much.