All they do is eat, sleep, and reproduce.

Q. My brother (a basketball player) says giraffes are the biggest land animals because they are the tallest. How do scientists determine what the biggest animals are? A. Scientists, as well as people ...

If you throw a huge party, there’s more of a chance of problems than if you host a quiet get-together for a couple of friends. The logic is simple: Having more people around means more opportunities ...

The new theoretical research proposes that animal size over time depends on two key ecological factors. The mystery behind why Alaskan horses, cryptodiran turtles and island lizards shrunk over time ...

Q. You wrote that blue whales are the largest mammals. What are the largest and smallest animals of other groups? What ecological problems do animals confront by being extremely big or extremely small ...

Biologists have launched a database of marine animals’ body sizes that they say could help preserve biodiversity in Earth’s oceans. Why bother measuring animals’ body size? In an article in Global ...