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Although native to Europe, earthworms are found throughout North America and western Asia. They do not live in deserts or regions where there is permafrost or permanent snow and ice. Typically only a few inches (7 or 8 centimeters) long, some members of this species have been known to grow to a snakelike 14 inches (35 centimeters). Earthworms‘ bodies are made up of ringlike segments called annuli. These segments are covered in setae, or small bristles, which the worm uses to move and burrow. These terrestrial worms typically dwell in soil and moist leaf litter. Their bodies are characterized by a „tube within a tube“ construction, with an outer muscular body wall surrounding a digestive tract that begins with the mouth in the first segment. As they burrow, they consume soil, extracting nutrients from decomposing organic matter like leaves and roots. Earthworms are vital to soil health and to plants growing in it because they transport nutrients and minerals from below to the surface via their waste. An earthworm can eat up to a third of its body weight in a day.
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Chipmunks are part of the squirrel family, and while they look similar to their bushy-tailed cousins, chipmunks are actually smaller, with alternating light and dark stripes along their cheeks and backs. There are 25 species of chipmunk, 24 of which live in North America. Chipmunks are excellent tree climbers and swimmers who live in a variety of habitats, including plains, mountains, forests, and deserts. Chipmunks like to live alone in holes or burrows called dens. Chipmunks hibernate in cold weather, which means they spend most of the winter sleeping in their dens. One chipmunk can gather up to 165 acorns in a day. In just two days, a chipmunk can collect enough food to last an entire winter, although chipmunks typically hoard much more food than necessary. Chipmunk young are born in late spring, and stay in the nest for up to six weeks. Female chipmunks have one or two litters per year, each with four or five babies. Chipmunks are 7.2 to 8.5 inches (18.5 to 21.6 centimeters) long including their tails, which can account for nearly half of their length.
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Mosquitoes are known the world over for their itchy „bites.“ And they’re also known for spreading some of the world’s worst diseases, including malaria, yellow fever, encephalitis, and dengue. Only female mosquitoes actually „bite.“ They use their mouth, which looks like an upside-down funnel with the narrow end pointing down, to pierce their „victim“ and sip liquid. This liquid could be either blood (human or animal) or plant juices, depending on the mosquito species. Male mosquitoes feed solely on plant juices. Different species prefer the blood of particular animals. Some mosquitoes feed only on snakes, frogs, or other cold-blooded animals. Other mosquitoes prefer birds. Still others prefer cows, horses, and people. Like most insects, mosquitoes have two compound eyes, each of which contains thousands of six-sided lenses that point in all different directions and move independently. Mosquitoes can’t focus their eyes like people. Instead, their eyes stay open to help them detect quick movements. The mosquito’s wings beat about 1,000 times per second and create the insect’s telltale buzzing sound. The female’s wings create a higher-pitched tone than the male’s, helping it attract potential mates. Most female mosquitoes lay their eggs—up to 200 at a time, depending on the species—in water or near it, although not all species must hatch their eggs in water. Favorite places to lay eggs include any place that water pools, such as marshes and swamps, plus tree holes, discarded containers, and poorly maintained swimming pools. Transparent parts that cover the mosquito egg keep it from sinking. In warm weather, most eggs hatch within three days.
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If you live in the contiguous United States, you’ve almost certainly seen (or heard!) an American crow. Crows range from southern Canada throughout the United States. As an adult, this bird is entirely black from bill to tail, except for its brown eyes. Adult crow feathers have a glossy sheen. These noisy birds are often recognizable by their distinctive, loud cry, called a caw. They are often mistaken for the common raven, but ravens are larger, have differently shaped bills, pointed wings and tails, and hoarser cries. American crows often live in family groups. Both members of a breeding pair help build the nests, and the female crow usually lays four or five eggs in the spring or summer. After about five weeks in the nest, the young birds begin learning how to fly and catch prey. Crows sometimes stay near the place where they were born to help raise other young crows. Crows gather in large groups during the winter. They congregate late in the day in areas with large trees. This behavior is known as winter roosting. Crows will eat almost anything, from insects and small animals such as frogs to fruit and nuts. They prefer open areas with access to trees and can sometimes be found around vegetable gardens. Crows also frequently live in suburban neighborhoods and in parks. Crows are considered to be very intelligent birds. Text by Sara Zeglin / NGS Staff
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Emperor penguins spend their entire lives on Antarctic ice and in its waters. They survive—breeding, raising young, and eating—by relying on a number of clever adaptations. These flightless birds breed in the winter. After a courtship of several weeks, a female emperor penguin lays one single egg then leaves! Each penguin egg’s father balances it on his feet and covers it with his brood pouch, a very warm layer of feathered skin designed to keep the egg cozy. There the males stand, for about 65 days, through icy temperatures, cruel winds, and blinding storms. Finally, after about two months, the females return from the sea, bringing food they regurgitate, or bring up, to feed the now hatched chicks. The males eagerly leave for their own fishing session at sea, and the mothers take over care of the chicks for a while. As the young penguins grow, adults leave them in groups of chicks called crèches while they leave to fish. There is a reason for the timing of emperor penguins‘ hatching. By December, when the Antarctic weather has warmed somewhat, the ice the penguins occupy begins to break up, bringing open waters closer to the nesting sites. Now the chicks are old enough to take to the seas and fish for their own food. Check out the book Penguins vs. Puffins for more about these amazing birds! Watch a YouTube playlist all about penguins.
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In the animal kingdom, these mothers rule! Check out five marvelous moms of the wild.
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Launching itself six feet above the ocean’s surface, a fish called a mobula ray does a flip before plunging back into the water with a splash. The fish is traveling with about a hundred other rays that also jump, twirl, and belly flop as they move through the sea. These marine animals are expert acrobats. But their moves remain a mystery to scientists. WINNING AT SWIMMING Mobula rays live in warm oceans throughout the world. These fish have a pair of winglike fins that can extend up to 17 feet. The fins help the rays rocket from the sea when they leap. Scientists aren’t exactly sure why all nine species of mobula rays do these jumps. But they think it may be to show off for a potential mate, get rid of parasites, or communicate. Mobula rays are as good at swimming as they are at jumping. As they travel, they move their fins up and down to steer through the water. Even baby mobula rays, born at 25 pounds with their fins curled, are gifted gliders. The babies, called pups, immediately unfold their fins and swim off. FAMILY DINNER Mobula rays tend to swim in schools of a hundred or more fish, especially while feeding. These marine animals snack on tiny fish and small sea creatures called zooplankton. They eat by scooping prey into their mouths with the floppy lobes that hang from either side of their heads. When the rays find an area rich with food, they make sure to share the grub with the group. These jumping fish make us want to leap for joy! Text by Meghan Modafferi, NGS Staff
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A caracal crouches in the tall grass, eyeing a bird perched on a nearby shrub. Suddenly the wild cat bursts from her hiding spot and bolts toward the fowl. As the bird takes off, so does the caracal. She leaps up six feet and swats her prey with her paw, causing it to fall to the ground. Then the cat scoops up the bird in her mouth. It’s dinnertime. SOLO CAT Caracals live on rocky hills or grasslands in the Middle East, Africa, and south Asia. The animal is one of more than 30 species of small wild cats. Most caracals grow about three feet long and can weigh over 40 pounds. The feline is usually most active after sunset. And this cat likes its me-time—adults spend much of their days alone, hunting for birds, rodents, rabbits, and gazelles. HUNTING AND HUGGING The body of a caracal is built for sneak attacks. Caracals are superfast, and with footpads cushioned by stiff fur they make practically no noise as they sprint toward targets. The animals’ strong hind legs allow them to jump six feet in the air—the height of a tall adult human. Tufts of hair on the tips of a caracal’s ears may enhance their hearing, making it easier for the cat to listen for prey. These hunters have a softer side too. Mom caracals (which usually have three babies in each litter) cuddle with their young. And the babies cuddle each other too. See, even ninjas need to snuggle sometimes. Text by April Capochino Myers
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Snow leopards are extreme athletes with some wizard-like abilities. Find out more about these big cats’ amazing skills.
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Adélie penguins breed and raise their young on the continent of Antarctica. In September and October—springtime in that part of the world—thousands of Adélies gather on the rocky Antarctic shoreline. The huge gatherings are called colonies. Adélie penguins build nests by scooping out areas in the ground. The female usually lays two eggs in the nest. Adélie penguin eggs hatch in December. In the Antarctic winter, the Adélie penguins live at sea. Both parents care for the eggs. While one stays behind keeping the eggs warm and safe from predators, the other parent heads out to sea to eat. They feast mainly on krill, tiny shrimplike animals, but also eat fish and squid. Parents take turns caring for their youngsters after they hatch until the chicks are about three weeks old. At that point, both parents may leave to forage for food while the chicks gather in the safety of a large group of other young penguins. These groups of young Adélies are called crèches. By March, when Adélie chicks are about nine weeks old, their downy baby feathers have been replaced by waterproof adult feathers. They plunge into the sea, and start hunting for food on their own. Like other penguin species, Adélies are excellent swimmers. They’re powerful and graceful in the water, with torpedo-shaped bodies that pierce through the water. Their modified wings help propel them through water instead of air. These birds are swimmers, not fliers. Check out the book Penguins vs. Puffins for more about these amazing birds! Watch a YouTube playlist all about penguins.
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