What are the smartest animals in the world and how do we know?

There are many members of the animal kingdom that rival our own wits.

By Claire Maldarelli
March 30, 2018

Latest

This pocket-sized shaggy reptile hopped around a pre-dino world
Six tips for writing emails that aren’t absolute garbage
Ignored by doctors, trans people turn to dangerous underground treatments
These survival tips might actually get you killed
The real difference between a cheap bike and an expensive one
It’s time to grieve the world we’ve lost to climate change—and start to move on
This photographer chases the Midwest’s most dramatic storms. Here are some of his favorite shots.
These six photos were snapped by satellites. Can you figure out where?
Bring your old bike back to life with these pro restoration tips