It's time for some "holiday" enrichment at the San Diego Zoo.

Zookeepers use enrichment to encourage natural animal behaviors.

It's time for some "holiday" enrichment at the San Diego Zoo.

How do you train a lion? Very carefully.

She uses a special vocalization to round them up, which they frequently, totally ignore.

How do you train a lion? Very carefully.

When you're only two weeks old and have this much energy, everything is an adventure.

At 12 weeks old, the cubs are very energetic and already showing unique personalities.

It's time for some "holiday" enrichment at the San Diego Zoo.

When you're only two weeks old and have this much energy, everything is an adventure.

How do you train a lion? Very carefully.

The piglets — three males and one female — were born in a den at their exhibit to mother Orkima, and father Stuart.

It's time for some "holiday" enrichment at the San Diego Zoo.

Learn about all the different kinds of enrichment activities zookeepers use to stimulate a pair of grizzly bear brothers.

As with human kids, when called... the cheetah cubs sometimes listen to mom and sometimes don't.

Watch these newest members of the San Diego Zoo family play with just about anything they can find in their exhibit.

As with human kids, when called... the cheetah cubs sometimes listen to mom and sometimes don't.

How do you train a lion? Very carefully.

At twelve weeks old, these cubs are highly active and already have strong personalities.

Take a peek into a warthog exhibit at the San Diego Zoo and learn all about their play behaviors and eating habits.

It's a Christmas miracle.

When you're only two weeks old and have this much energy, everything is an adventure.

Witness a day in the life of two grizzly brothers, Scout and Montana. Their favorite food may not be what you expect.

Zookeepers use enrichment to encourage natural animal behaviors.