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There are more than 200 species of squirrels living all around the world, including kinds of tree, ground, and flying squirrels. You may have seen the eastern gray squirrel in parks, your backyard, or in a forest in the eastern half of the United States. Eastern gray squirrels forage for nuts, seeds, buds, and flowers of trees. Like other tree squirrels, the eastern gray squirrel plays an important role in what’s known as seed dispersal. As winter approaches, squirrels carry their food and bury it in several locations. They hide more food than they will recover or eat. The buried seeds and nuts sprout and begin to grow in these locations the following spring. Eastern gray squirrels have an excellent sense of smell, which they use to help locate food that they’ve hidden away. They can also pick up information about their fellow squirrels by smelling them. They communicate with each other by making sounds and body movements, such as tail flicking. When predators such as red foxes and red-tailed hawks are nearby, eastern gray squirrels will sound warning calls to alert other squirrels. Female eastern gray squirrels may start having babies at as young as five and a half months old. Females can have litters twice a year, each usually consisting of two to four babies. They gather leaves and twigs and build nests high in the trees to house their young offspring, or use tree cavities as dens. Newborn eastern gray squirrels don’t have fur when they are born and are not able to see. They often weigh as little as half an ounce (14 grams). They leave the nest by around ten to twelve weeks old and they become fully grown by around nine months.
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A hungry bobcat crouches behind a bush, looking at the field beyond its leafy hideaway. Suddenly, a squirrel darts across the ground. As the squirrel draws near, the cat leaps from the bush and scoops up the prey in its mouth. It’s dinnertime.
with their scent as a way to tell other bobcats to back

Although Nile crocodiles resemble armored tanks with huge, teeth-filled mouths, these reptiles are unusually attentive parents. When a large male croc spots a female that catches his eye, he bellows and splashes, slapping his snout on the water to get her attention. He grunts and growls, and sometimes, inhales as hard as he can, submerging his snout and blowing water through his nostrils, producing a fountainlike spray. The female croc is ready to lay her eggs nearly two months after mating. She scouts the area for a suitable nest site in which to lay the eggs, usually digging a hole on a riverbank, shoreline, or dry streambed. She deposits from 25 to 80 eggs in the nest, then settles in for a long vigil. For a reptile, it’s an unusual display of devotion. Other reptiles lay their eggs, then move on. The female croc, however, will keep constant guard over the nest during the three-month incubation period, leaving only to cool off in a nearby shady spot or for a quick dip in the water. The male is usually close by to help scare off predators. Just before hatching, the young crocs send out high-pitched sounds—a signal for help. The female digs up the nest. The mother croc then carefully picks up the 12-inch- (30.5-centimeter-)long hatchlings in her mouth and carries them to the water. The young crocs live under their mother’s protection for up to two years, feeding on insects and small fish and growing about a foot (about 30 centimeters) each year.
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Crossing a beach to get to the sea, a two-foot-tall Humboldt penguin waddles over what appears to be a cluster of large boulders. Suddenly one of the rock-like objects rises up and barks! The penguin is stepping on sea lions lounging on the shore. Sea lions prey on Humboldt penguins in water but are too slow to catch them on land. The bird continues to ruffle feathers as it climbs over more annoyed sea lions. But it finally makes it to the ocean and dives in for a swim. A GOOD SPORT Humboldt penguins live along the shores of Peru and Chile, two countries in South America. Named for a chilly water current that flows through their coastal range, these birds are excellent swimmers. Their torpedo-shaped bodies can shoot through the water at speeds of 30 miles an hour. And they can dive up to 500 feet underwater in search of snacks such as fish, shrimp, and squid. When the birds need a break from swimming, they come ashore. Getting around on land isn’t always easy. Parts of their habitat feature rocky seaside cliffs. Luckily the animals have some built-in climbing gear: They use sharp claws on their webbed feet to grip onto rocks as they move across the rugged landscape. The animals also put their climbing skills to use when they have to scramble over sunbathing sea lions blocking their path to the ocean. THINK PINK During the hottest months of the year, temperatures in the Humboldt penguin’s home can reach triple digits. The animal has ways to beat the heat though. It sports patches of bare, pink skin around its eyes and at the base of its bill. The bird expels body heat through these featherless spots. This little guy’s athletic abilities and its pink patches make it one colorful penguin! Check out the book Penguins vs. Puffins for more about these amazing birds! Watch a YouTube playlist all about penguins. Text by Andrea Silen, NGS Staff
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Make some tasty treats when the weather gets cold.
Step 6 Place the tray back in the oven and cook for

As nighttime approaches in a tropical rain forest in parts of Sumatra and Borneo in Asia, orangutans prepare for sleep. In forks of trees high off the ground, shaggy, red-haired apes bend branches down to form comfortable mattresses of leaves and twigs. They sometimes add a roof built from more branches, so that if it rains they will stay dry. Though an adult male orangutan can weigh up to 220 pounds (100 kilograms)—females weigh about half what males do—orangutans spend most of their time up in the trees. They are the largest of all arboreal animals. Equipped with very long, powerful arms and hook-shaped hands and feet, these apes climb and swing from tree to tree with ease. They reach from one tree to the next with their long arms, grasping the next branch with long hands or feet, and swing their bodies across the gap. If a baby following its mother reaches a gap between trees that is too wide for it to navigate, its mother makes a living bridge for the baby to scamper across. Sometimes heavier males can’t find branches strong enough to hold their weight, so they climb down to get to the next suitable tree. On the ground, orangutans walk on all fours. Orangutans find their food in the trees where they live. More than half their diet consists of fruit. They also eat nuts, bark, and other parts of plants and trees. Every once in a while they eat insects such as ants and termites, as well as bird eggs. Orangutans find the water they need for drinking up in the trees—in hollows, on leaves, or even on their own fur after a rain. Trees are essential to every aspect of the orangutans‘ world. The cutting down of trees—deforestation—has landed this species on the endangered species list.
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The body’s control center
brain then uses motor neurons to transmit the message back

Get the facts on Venus, sometimes called Earth’s twin.
heavy clouds, but rest assured that your friends back

Get the facts on Mars, also known as the red planet.
That was back when the atmosphere was thicker.

The great horned owl has no horns! It is named for the tufts of feathers that sit on top of its head, called plumicorns. Scientists don’t know why these owls sport the tufts, but they do have a few theories. The tufts might help members of their own species to recognize each other among the forest around them, or they may use the tufts to blend into their surroundings, making them look more like broken tree branches than a tasty meal. The great horned owl is one of the most common owls in North America, found in a range of habitats that includes forests, swamps, deserts, tundra edges, tropical rain forests, cities, suburbs, and parks. If you live in North America, there’s a good chance you’ve heard the deep, soft, stuttering hoots of this owl: hoo-h’HOO-hoo-hoo. This owl uses this hoot to advertise its territory. It can also make a variety of other sounds, including whistles, barks, shrieks, hisses, coos, and wavering cries. You are most likely to hear an owl hoot at night because they are nocturnal birds. They have big eyes and wide pupils that allow them to spot their prey. Unlike people’s eyes, their eyes don’t move in their sockets, but the owls can swivel their heads to look in any direction. Their short but wide wings allow them to fly through the forest, and their soft feathers help them approach prey very quietly. Great horned owls eat a wide variety of prey—from small rodents to skunks and geese. Like other owls, these birds sometimes swallow their prey whole and later regurgitate pellets composed of bone, fur, and other unwanted parts of their meal. These fierce predators are also great parents. Mated pairs will find a nest—usually a disused nest from another large bird species—and will defend it from intruders at all costs. Baby great horned owls are ready to fly at between 10 and 12 weeks old. Text by Allyson Shaw / NGS Staff
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