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QI...Quite Interesting...

Here's some that I found:

Horses can lock their knee and elbow joints to enable them to stand (and sleep) without using their muscles.

Until the Sixties, ferrets were used to carry cable to inaccessible areas of Boeing aircraft as they were being built.

Eagles lay clutches of two eggs, but the first chick to hatch usually kills its sibling, even when food is abundant.

Polar bears aren't white. Their skin is black and their fur is translucent.

As octopuses have no skeleton, they can squeeze through spaces as small as their eyeballs.

Because a pigeon cant move its eyes, it thrusts its head forward when walking to keep it stable and maintain life-preserving visual focus.

A dolphin's skin is shed and replaced every two hours.

If a goose is shot down, its partner will return to earth to stand vigil.

Fat is a raccoon issue: for some, 50 per cent of their body is fat.

An elephant's trunk is powerful enough to kill a lion with a single blow, yet the finger-like lobes at the end can pick up a grain of rice.

If you turn a shark upside down, it will go into a trance-like state, or "tonic immobility", for 15 minutes.

Fruit flies were the first animals in space and are still used by Nasa.

Moose antler is the fastest-growing animal tissue, sprouting an inch a day.

EDIT:

Quote:

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Useless Triva? Muwahahahaha! The animals with the shortest gestation period are hamsters! The British spend 5,000,000 annually on sausages! A month's worth of junk food and sweets contan enough fat to make another person! Muwahahahaha!

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I thought it was the American Opossum? According to this, at least:
The shortest is the American opossum, which bears its young 12 to 13 days after conception.