When cows graze in their natural head-down position, their saliva production increases by 17 percent.
The sperm whale is the mammal with the heaviest brain — about six times heavier than a human's.
The spines on a newborn hedgehog start to appear within 24 hours.
When eating, vultures often gorge themselves to the point that they can't fly. The bird will quickly regurgitate its meal to become light enough to escape if flight from an attacker is necessary.
When thirsty, a camel can swig down 25 gallons of water in less than three minutes.
The spiny cheek, starsnout poacher, and monkeyface prickleback are all names of fish.
When under extreme stress, such as when held in captivity, some octopuses will eat their own arms, which grow back.
The squirrel monkey's brain accounts for roughly 5 percent of its body weight — the largest percentage of any other animal. The human brain, by comparison, makes up about 2.3 percent of body weight.
When young abalones feed on red seaweed, their shells turn red.
The star-nosed mole, with 22 pink tentacles on its snout, is said to have the most delicate sense of touch in the animal world.
When young, the hoatzin, a crested, olive-colored South American bird, has claws on its wings.
The stegosaurus had a brain that weighed only 2 ounces and was no bigger than a walnut.
While awake, hummingbirds must eat at least every 30 minutes or they will starve to death. They need to eat 2.5 times their body weight every day — this takes hundreds of flowers everyday.
The striped skunk can fire its musk stream accurately for up to 12 feet, and even farther with a cooperative downwind.
While dangerous to swimmers, the fact remains that barracudas are much less dangerous than sharks.
The tailorbird of Africa makes its nest by sewing together two broad leaves. It uses fiber as the thread and its bill as the needle.
While many people believe that a camel's humps are used for water storage, they are actually made up of fat. The hump of a well-rested, well-fed camel can weigh up to eighty pounds.
The tarantula spends most of its life within its burrow, which is an 18-inch vertical hole with an inch-wide opening. When male tarantulas are between the ages of 5 to 7 years, they leave the burrow in search of a female, usually in the early fall. This migration actually signals the end of their life cycle. The males mate with as many females as they can, and then they die around mid-November.
While some sharks lay eggs, blue sharks give birth to live pups, as do about two-thirds of all sharks, estimated at nearly 350 species.
The three-toed sloth of tropical America can swim easily, but it can only drag itself across bare ground.
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