There are millions of different types of living things on Earth. In order to keep track of them all, scientists put living things into groups based on characteristics that they have that are the same.

Dedication to William Buckland / Christopher J. Duffin -- Introduction. Vertebrate coprolite studies : status and prospectus / Adrian P. Hunt ... [et al.] -- History of study. The earliest published ...

This tiny frog in the world lives in the leaf litter of Papua New Guinea's rainforests and can jump over 30 times its body ...

A tiny fossil fish, roughly 3 centimeters long and approximately 436 million years old, has been identified as the oldest known bony fish ever found, pushing back the timeline for when the ancestors ...