New research is unraveling the old mystery of how air-breathing animals manage to dive so far beneath the waves and stay down so long.

Book claims they're the first air-breathing animal.

Being air-breathing animals, the living arachnids use internal fertilization, which is direct in some species, in other words the males' genitalia make contact with the females'.

(An air-breathing animal, if such the monster is, would have large lungs and would be expected to give a strong signal.)

Most vertebrates that live on land are amniotes, as are most of the air-breathing animals of the sea.

They were surprised to find that an air-breathing animal could survive in such a location.

Oceans Oceans Are we air-breathing animals always out of our depth in water?

The lung is the essential respiration organ in many air-breathing animals, including most tetrapods, a few fish and a few snails.

It is possible that the choana started as a natural crack between maxilla and premaxilla because of an incomplete fusion in air-breathing animals.

There is no hard-and-fast divide between water-breathing and air-breathing animals.