Who first scientifically described the Holothuria stellati: Hubert Ludwig, Theodore Lyman, Delle Chiaje or Emil Selenka?

How is it possible to determine the sex of a parakeet?

These animals reach lengths of up to 7 feet, have about 100 teeth, emit sounds when moving to help them navigate, and reach travelling speeds of about 35 miles per hour. What kind of animals are they?

What are two common names for jumping, tailless amphibia?

What's the difference between a turtle and a tortoise?

The largest type of living bird can be 9 feet in height and weigh 350 lbs (160 kgs). What kind of bird is it?

By what name do we identify those certain kinds of weasels whose coats change color in the winter?