Did you know that the biggest animal that ever lived is still alive today? Let's learn all about what blue whales eat, where they live, and just how big they are, with Jessi and Squeaks!

Pods of killer whales inhabit the waters of every major ocean on Earth. Each family is able to survive thanks mainly to one member, its most knowledgeable hunter: the grandmother. These matriarchs can live 80 years or more and their...

All mammals share certain characteristics, like warm blood and backbones. But despite their similarities, these creatures also have many biological differences - and one of the most remarkable differences is how they give birth. Kate...

Howcast - Learn how to do the single-leg calf raise for a female leg workout from personal trainer Erin Sharoni in this Howcast workout video.

Howcast - Learn how to do calf stretches from personal trainer Erin Sharoni in this Howcast workout video.

Howcast - Learn how to do military stretching exercises in this US army basic training video from Howcast with Sergeant Michael Volkin.

Howcast - Learn how to do a Queens accent from voice and speech coach Andrea Caban in this Howcast video.

Howcast - Learn how to tone your legs and butt while pregnant from fitness expert Cait Morth in this Howcast workout video.

Howcast - Learn how to do a calf stretch from personal trainer Mindi Smith in this Howcast sexy legs workout video.

Howcast - Learn how to massage the calves using deep tissue massage techniques from celebrity massage therapist Meagan Holub in this Howcast video.

Howcast - Learn how to stretch before a run from competitive runners Doug Oldiges and Stephanie Coburn in this Howcast video.

Howcast - Learn how to do a calf crush from inside guard leg lock in this Howcast video about lower body submission techniques for jiu jitsu, judo, and mma.

Howcast - Learn how to do a calf crush leg lock in this Howcast video about lower body submission techniques for jiu jitsu, judo, sambo, and mma.

Howcast - Learn how to do a leg knot leg lock in this Howcast video about lower body submission techniques for jiu jitsu, judo, sambo, and mma.

Howcast - Learn foam rolling techniques that help with shin splints in this Howcast video featuring certified NYC trainer Amanda Edell.

Howcast - Learn how to foam roll your calves in this Howcast video featuring certified NYC trainer Amanda Edell.

Howcast -Learn how to do a single leg pelvic tilt from certified personal trainer Amanda Edell in this Howcast ab workout video.

Howcast - Language specialists say the calf muscle may have gotten its name because its shape resembles a young bull. Minus the horns, we assume.

See what brought this unlikely pair together.

Why zookeepers have to do bottle feedings with him five times a day.

Every rhino calf born is important to the population.

Watch as Harriet's four-day-old calf is introduced to some gazelles and the rest of the giraffe herd at the San Diego Zoo.

See why it's such a big day at the San Diego Zoo nursery.

Keepers at the San Diego Zoo Safari Park are bottle-feeding giraffe calves.