A reader pushes back against the human tendency to see animals as merely cute.

The biggest animals should have the highest risks of developing tumors, but they don’t.

There are not enough humans to take care of all the animals.

Every creature lives within its own sensory bubble, but only humans have the capacity to appreciate the experiences of other species. What we’ve learned is astounding.

How did pet abuse become such a theme of this campaign?

Researchers didn’t know how people would react to weightlessness. So they sent animals first.

As service animals, capuchins change people’s lives—but they may suffer in the process.

Their experiments confirm that sex is pleasurable, even for animals we think of as simple.