7 Animals That Depend On Humans And Other Related Facts!
Animals that depend on humans include chickens, dairy cows, sheep and dogs. Learn why they need our care and which animals people depend on.

Animals that depend on humans include chickens, dairy cows, sheep and dogs. Learn why they need our care and which animals people depend on.

The weakest animals in the world, from zooplankton and worms to koalas, sloths and fairyflies, and how each one tries to survive predators.

Lobsters have two different claws: a slow, strong crusher for breaking shells and a fast cutter for grabbing food. Both start out identical.

Animals with no tongue include sea stars, crustaceans and insects, which eat using other body parts. Plus, the giant anteater's 2-foot tongue.

Animals with blue blood, like octopuses, squid, horseshoe crabs and spiders, carry oxygen with copper-based hemocyanin. See 8 examples.

Animals that wallow in mud, like pigs, rhinos, hippos and elephants, use it to cool down, block the sun and keep biting insects away. Meet 9 of them.

Do rhinos have tails? Yes. Rhino tails are short, about 2 to 3 feet in larger species, and end in a tuft of hair they use to swat away biting flies.

Camels have thick fur on their backs to insulate against cold desert nights and strong sun, which also saves water. Learn how their coat works.

Elephants don't hunt, since they are herbivores, but they do kill other animals when threatened, protecting calves, or when bulls are in musth.

Animals that laugh include apes, rats, dogs and kea parrots. Researchers found laugh-like play sounds in 65 species. See which of our 14 really laugh.