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Photograh by Andreanita, Dreamstime Black rhinoceroses have a sort of attack-first-and-ask-questions-later

Koalas are marsupials, related to kangaroos.
Size: 23.5 to 33.5 inches Weight: 20 pounds Most marsupials have

Monarch butterflies live in North, Central, and South America as well as Australia, some Pacific Islands, India, and Western Europe. They’re on the endangered species list. Find out how you can help protect their habitat.
Females have thicker veins in their wings.

This double-crested dino was an early top predator.
ve even been topped with eye-catching inflatable air sacs like some modern birds have

The red-tailed hawk is a top predator. The hawks use tall perches to spot their prey in the open spaces next to highways. Red-tailed hawks also hunt from the air. As they circle and soar, they can spot a mouse from 100 feet (30 meters) up in the air—about ten stories high. When a red-tailed hawk spots a rodent, rabbit, lizard, or other prey scurrying, it swoops down and grabs its meal in its talons—the big claws on its feet. Once the hawk grabs its prey, it usually flies back up to its perch to eat it. They were named for the variety that has a brick-red tail. Male and female red-tailed hawks basically look alike, though the females are larger. Red-tailed hawks often mate for life. The pair makes a stick nest in a tree, high above the ground. They will use the nest year after year, so it grows bigger and bigger. The female hawk lays one to five eggs—which are white with brown spots. The parents take turns sitting on the eggs, keeping them warm and safe. Baby red-tailed hawks are covered with white, downy feathers. The hawk parents feed their young until the young birds can leave the nest, usually when they’re about six weeks old.
They have to turn their heads to see to the side.

Learn all about these bamboo eaters.
To stay healthy, they have to eat a lot—up to 15 percent of their body weight in

Seahorses are tiny fishes that are named for the shape of their head, which looks like the head of a tiny horse. There are at least 50 species of seahorses. You’ll find them in the world’s tropical and temperate coastal waters, swimming upright among seaweed and other plants. Seahorses use their dorsal fins (back fins) to propel slowly forward. To move up and down, seahorses adjust the volume of air in their swim bladders, which is an air pocket inside their bodies. Tiny, spiny plates cover seahorses‘ bodies all the way down to their curled, flexible tails. The tail can grasp objects, helpful when seahorses want to anchor themselves to vegetation. A female seahorse lays dozens, sometimes hundreds, of eggs in a pouch on the male seahorse’s abdomen. Called a brood pouch, it resembles a kangaroo’s pouch for carrying young. Seahorse young hatch after up to 45 days in the brood pouch. The baby seahorses, each about the size of a jelly bean, find other baby seahorses and float together in small groups, clinging to each other using their tails. Unlike kangaroos, baby seahorses do not return to the pouch. They must find food and hide from predators as soon as they’re born.
These fish don’t have true stomachs, just a digestive tube, so they need to eat all

Today, bison numbers have rebounded somewhat, and about 200,000 bison live on preserves
Today, bison numbers have rebounded somewhat, and about 200,000 bison live on preserves

Get pictures and fun facts about eight micro-bacteria that live on you.
Most people have about 67 different species living harmlessly in their navels.

, gray wolfs are classified as endangered, but in most places, they are seen to have
, gray wolfs are classified as endangered, but in most places, they are seen to have