Meet Santiago, the Patagonian Mara. Watch as Zoo Educator Hannah demonstrates what positive reinforcement is, and why it's an important technique in providing excellent care for animals like Santi.

Handlers at the San Diego Zoo weigh in the newest resident.

Learn about efforts to re-establish this critically endangered amphibian back into southern California.

Watch the newest member of San Diego Zoo's reindeer herd explore the exhibit with mom.

She what makes her an integral member of the troop, from being both a surrogate mom and now a surrogate grandma.

Learn how handlers at the San Diego Zoo were able to halter train this darling Okapi, a member of the giraffe family.

She what makes her an integral member of the troop, from being both a surrogate mom and now a surrogate grandma.

Watch the newest member of San Diego Zoo's reindeer herd explore the exhibit with mom.

Watch as these two females set out to explore the new exhibit at the San Diego Zoo, and see what makes South America's largest canid so unique.

On this fascinating island on the Great Salt Lake, see how fast and gracefully these rams can move on steep, rocky slopes.

Due to introduced predators, disease, and habitat destruction, they are almost out of time. See what other challenges the team faces.

Due to introduced predators, disease, and habitat destruction, they are almost out of time. See what other challenges the team faces.

Learn all about these incredible birds.

Learn what goes into the process of a unique form of enrichment at the San Diego Zoo and what makes this cake special.

The neonatal assistive care unit at the San Diego Zoo watches over an 11-day-old female.

As part of a routine health checkup, veterinarians at the San Diego Zoo discovered this little guy has an arrhythmia, or an irregular heart rhythm. See how they get him back to his usual active self.

Most diets that are fed to rhinos at zoos are associated with low fertility. Here's how scientists are fixing that.

Meet San Diego Zoo's newest residents, Kima and Koya.

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

Why starting his life with a 'fall' is very important.

It's not as easy as it seems.

See why Bai Yun is the "queen bee" when it comes to her birthday.

Male platypuses use this unique, hidden defense mechanism to fend off other males in the breeding season.

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