He is always hanging out with bad friends. Truly, birds of a feather flock together.

He is an expert in paleoanthropology, conducting research on the origins of mankind.

Rodents are widely distributed around the world.

He is an expert in paleoanthropology, investigating archaeological sites around the world.

He is an expert in primatology and is engaged in the study of gorilla behavior.

He is famous as a countertenor singer.

Odd-toed ungulates include mammals such as horses and camels.

Even-toed ungulates are a large group of animals that include some livestock such as cows and sheep.

Myriapods belong to the same Arthropoda phylum as insects.

Alkaline earth metals are located in Group 2 of the periodic table.