There's a group trying to save the functionally extinct northern white rhino using in vitro fertilization. But the ethics around using assisted reproductive technologies to save endangered animals are far from simple.

It arose from rhino ancestors that were a lot smaller, but Paraceratherium would take a different evolutionary path. Believe it or not, it actually became so big that it probably got close to what scientists think might be the actual...

We all know ducks quack, dogs bark, and birds chirp, but that barely scratches the surface of all the amazing ways animals have devised to talk to each other!

Featuring Emily of The Brain Scoop ( / thebrainscoop ) and Cas the Arctic Fox! We decided it would be cool to have guests come into the studio and talk about science with Hank.

What has tough skin, a tiny tail, and a big horn on its nose? A rhino! Join Jessi and Squeaks and learn all about these super cool, super strong animals!

Today's extraordinarily depressing dose comes to you in honor of Lonesome George, the world's last Pinta Island tortoise, who passed away earlier this summer - Hank brings us the stories of five more extremely rare animals who may be...

Scientists were able to get molecular information from 1.7 million years old teeth using a new method that could completely change how we study extinct organisms.

Unicorns may not exist on this planet, but Earth does have plenty of one-horned creatures that are just as remarkable, if not quite as majestic.

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Howcast - Learn what stop motion animation is from Joe Vena of the Children's Museum of the Arts in this Howcast video.

Every rhino calf born is important to the population.

Every rhino calf born is important to the population.

Why every rhino calf born is very important to the gene pool.

This little rhino calf loves running around and playing in the exhibit, and asserting his "authority" over some of the other animals.

Every new rhino calf born is incredibly important to the population. Here's where science comes in.

Follow along on her day of discovery and learn what makes her extra special.

This baby rhino is getting a grand tour of the San Diego Zoo Safari Park's 40-acre field enclosure - and there's no obstacle she can't handle.

Follow along with a rhino keeper as she takes you on a tour of a one-of-a-kind, 1,800-acre exhibit recreating the African and Asian savannas.

Why zookeepers need to supplement her feeding to make sure she hits her growth milestones.

Watch as zookeepers fill in for mom.

Watch how introductions are made, and see a big brother meet his baby sister for the first time.

With mom at his back, he's ready to take on the world.

It's the 94th southern white rhino born at the San Diego Zoo since 1972, and mom Casey's second baby.

Every calf born is very important to the gene pool.

Watch this energetic little guy explore the San Diego Zoo Safari Park with his mom never far behind.