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Giraffes are the tallest mammals on Earth. Their legs alone are taller than many humans—about 6 feet. They can run as fast as 35 miles an hour over short distances, or cruise at 10 mph over longer distances. Giraffes spend most of their lives standing up; they even sleep and give birth standing up.


Giraffes are the world's tallest mammals, thanks to their towering legs and long necks. A giraffe's legs alone are taller than many humans—about 6 feet . These long legs allow giraffes to run as fast as 35 miles an hour over short distances and cruise comfortably at 10 miles an hour over longer distances.


Giraffes live primarily in savanna areas in the sub-Saharan region of Africa. Their extreme height allows them to eat leaves and shoots located much higher than other animals can reach. In particular, they seek out acacia trees. Their long tongues are helpful in eating because they help pull leaves from the trees.


Three hearts, to be exact. There is a systemic (main) heart. Two lesser hearts pump blood to the gills where waste is discarded and oxygen is received. They work like the right side of the human heart.

 

Hagfish have primitive circulatory systems composing of four hearts and 5-15 pairs of gills. The main heart, known as branchial heart, pumps the blood to all parts of the body while the other three hearts serve as accessory pumps.