A bark scorpion in Arizona

How Does a Scorpion Decide When to Sting?

There are actually two decisions to make: whether to sting at all and whether to use prevenom or full venom.
Blue viper snake eating a frog, Indonesia

How Snakes Swallow

A snake’s ability to swallow enormous prey has long been a source of fascination, but the common explanation that they dislocate their jaws is a myth.
A geometrid moth caterpillar

Camouflage Gets Weird

Some animals use chemical camouflage, even altering the way they smell in order to avoid predation.
A tarsier

Can Wildlife Adapt to Heat Waves?

Heatwaves have led to widespread deaths of animals like big-eyed tarsiers and flying foxes. Is there hope for species like this as temperatures rise?
Two wolves

The Totally Unromantic Origin of Monogamy

Evolutionary biology offers theories as to why some mammals engage in monogamy. And no, it's not because they're in love. (Sorry.)
Sleeping dog

Extreme Napping in the Animal Kingdom

Although sleep is ubiquitous for animals with brains, differences in how, why, and for how long animals sleep remain unexplained.
altruistic marmot

Why Do Animals Share?

Natural selection should weed out the do-gooders and leave only egoists, but animals share just the same.
cute puppy

Anthropomorphism’s Pros and Cons

Humans see our own expressions everywhere, especially on dolphins and domesticated pets.
Chimpanzee working with a tool.

The Incredible Range of Chimpanzee Behavior

So why are chimpanzee throwing rocks at trees? And then collecting the rocks in piles to use again?