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Migration Ecologist tests the first test ever of an electronic tag on a monarch butterfly.

Red crab larvae hatch and head for dry land, covering Christmas Island's shores in delicate little crablings.

Crab males endure a harrowing journey towards sea -- facing yellow crazy ants and traffic along the way.

Mother bats prepare for migration, giving their young as much milk as they can and oiling up their wings.

Cameraman Rick Rosenthal talks about just how complicated it was to find male sperm whales.

While searching for elephants, cameraman Bob Poole and his crew are encased in a massive dust storm.

Watch the Packs & Swarms video, part of World's Deadliest on Nat Geo WILD.

A tremendous mouse infestation invades the Australian farming community. But what could be causing the plague-like conditions?

Colobus monkeys perform aerial acrobatics to escape attack from Gombe chimps.

Break In Bear video from the Swamp Men series on National Geographic Channel.

Panther Down video from the Swamp Men series on National Geographic Channel.

The Swamp Men newbies need to prove they have what it takes to survive 'Safari'.

Things heat up at the Billie Swamp Safari...

There's a major security breach and the Swamp Men need to restore some order.

The animals at the safari are getting restless!