As this formula is based on data from mammals, it should be applied to other animals with caution.

Many investigators favor chickens because of their phylogenetic distance from mammals.

The viruses have only been isolated from mammals to date.

They have been isolated from humans and other mammals.

Later scientists offered further support for Cope's rule, from mammals to corals.

They also kept sled dogs collected fur from marine mammals.

Has about 850 animals from birds, reptiles and mammals distributed for over than 120 species.

There is evidence that fleas from other mammals have a role in human plague outbreaks.

Some scientists believe boys are descended from small, smelly mammals.

Pesce-pollotarians: They eat fish and poultry, but not red meat from mammals.