Now consider a pack of wolves in the snow.

A wolf pack closes in on a moose from different sides.

A moose is far bigger than one wolf, and one wolf cannot catch it.

The pack chases the moose from all sides, and catches it.

The wolf pack does a job for each wolf: getting food.

Two groups, two jobs: staying safe, and getting food.

Now consider honeybees in winter.

Honeybees packed into a ball inside the hive in winter.

Thousands of bees crowd together into a ball inside the hive.

The bees in the middle of the ball stay warm, even on the coldest night.

The bee group does a job for each bee: keeping warm.

Three groups, three jobs: staying safe, getting food, keeping warm.