Have you noticed that both you and your pets tend to chub up over time?

 Scientists are gathering evidence that it’s not a coincidence. The usual candidates, poor diet and lack of exercise, while certainly important factors, may not be the only causes.

Feeling claustrophobic? Steve Leonard crawls down a wombat burrow to discover more about this Extreme Animal's main defence tactics. Watch out, they may be cute when they're babies, but become feisty adults!

Click here to watch some of the wierdest creatures to survive in the extreme tempteratures of the Anades.

See here how a wild camel produces excess saliva to impress a mate and warn other males of its ferocity. The desert is a dangerous place for seduction on the planet.

It's a zebra, it's a horse - no, it's an okapi. Not discovered until the 20th century, the okapi's closet relative is actually the giraffe.

A chance to see springbok antelopes, the most successful grazing animals in the Southern African Kalahari desert as they attempt to ward off a family of hungry cheetahs by jumping up to two metres into the air.

The largest creature in the sea and the largest creature that has ever lived, this amazing clip shows the awesome size of the Blue Whale.

These gigantic cows resemble bovine body-builders. See how breeders have achieved such amazing results.

A group of wild stallions might be a stubborn bunch, but no moreso than a lone wild stallion protecting his harem of mares.

Goats that faint? Don't ever tell these guys to drop dead.