The rangers had one major animal-related problem: poaching.
Most major animal phyla contain venomous species, but relatively few come into harmful contact with humans.
Whereas Wallace highlighted six major animal realms, the team identified 11, and within those realms made 20 regional distinctions.
"Mad cow disease is very unlikely to become a major animal or public health problem in the United States," said Dr. George M. Gray, who led the research team.
But they do not include many rare species and major animal groups that live in less biologically rich regions ("cold spots").
"For any major animal group you can think of," Dr. Johnsen said, "there's a transparent representative swimming out in the ocean".
The first major animal tweeter, in 2007, was @sockington, who is modelled on an actual gray cat with white paws rescued from a Boston subway station.
It was thought the Cambrian explosion was the period in which most major animal phyla appeared and that Precambrian rock was largely devoid of life.
Rodeos are condemned by every major animal protection organization in the United States Rodeos are not accurate or harmless portrayals of ranching skills, but displays and encouragement of insensitivity to and acceptance of brutal treatment of animals.
