A kangaroo cannot jump if its tail is off the ground.
29
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
The difference between antlers and horns is that antlers are shed each year and are made of bone while horns are kept for life and are made of living tissue and bone with a sheath that is very similar to human finger nails.
10
The most expensive cow in the world was sold in 2009 for $1.2 million.
-3
The ancestor of all domestic cats is the African Wild Cat which still exists today.
12
The lifespan of mammals is about 1 and a half billion heartbeats.
127
A hummingbird weighs less than a penny.
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