Giraffes are the tallest animals on Earth.
A giraffe's neck has just seven bones, no more than a human's, but each bone is a foot long. The whole neck is flexible enough for a giraffe to scratch its back with its nose. A large piston holding the neck onto the shoulder copies the real animal's powerful neck muscle. A giraffe has a huge heart-about 40 times heavier than a human's and strong enough to pump blood through very long blood vessels. To 1,500 lbs.