What goes into preparing a lemur troop's diet at the Franklin Park Zoo, as well as all the crucial steps of setting up their exhibit properly. See how the troop interacts and goes about their forage feeding.

Also: zookeepers manage to get an ultrasound on a pregnant panda, and celebrate a panda's third birthday.

Learn all about the early life stages of Malayan tiger cubs.

Zookeepers are celebrating the anniversary by giving her special treats and some time all to herself on exhibit.

It's enrichment day at the San Diego Zoo's gorilla exhibit.

See what goes into making this wintry experience a reality.

See why zookeepers are excited about these shaggy creatures.

The litter of Sumatran tiger cubs consists of Nelson, Cathy, and Debbie, and they're wasting no time at all.

Learn all about this peculiar creature hailing from mountainous regions of the Americas.

The old otter exhibit has been renovated for the African penguins who are fresh out of quarantine.

Watch them explore all the nooks and crannies of the habitat for the first time. Sumatran tigers are critically endangered, with only about 150-250 left in the wild.

The new exhibit encompasses climbing structures and mountainous terrain.

He'll find it no matter how well his zookeeper handlers hide it.

See how the rest of the herd interacts with the pair.

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

This 8-month-old orangutan is entering a prime stage of discovery.

You won't see this in the wild.

It's a big day of discovery.

A budding sense of adventure is getting him into all sorts of trouble.

Learn the difference between an albino and a leucistic animal.

Due to human encroachment on their natural habitat in the mountains, they are moving higher and higher up.

Mr. Wu is definitely a thinker, more than a doer, compared to his siblings.

Today is their first day out on exhibit, and they have a lot of exploring to do.

Visitors to the zoo often mistake these unusual-looking residents for hippos, pigs, or even anteaters. Meet Contessa, Iibu, and Tupi.