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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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A rainbow-colored crustacean skitters along the ocean floor, adding a splash of brightness to the murky setting. The animal’s narrow, hard-shelled body sports orange, green, red, and blue hues. Known as the peacock mantis shrimp, this beautiful, seven-inch-long critter looks harmless. But the marine animal packs a punch—literally. SHRIMP SMACKDOWN Peacock mantis shrimp mostly live in shallow parts of the Indian and Pacific Oceans. The crustacean spends much of its time looking for crabs and mollusks to eat. When it finds a delicious-looking snack, the animal goes into full-on boxer mode. Springing out one of its club-like front claws, the animal delivers a swift punch to its prey. The punch is 50 times faster than the blink of an eye and strong enough to break glass! These shrimp also rely on their sparing moves to keep enemies away from burrows in the ocean floor that they use as shelters. Hovering at the opening of its burrow, a peacock mantis shrimp will strike at intruders that come too close. EYES ON THE PRIZE The crustacean has another eye-popping feature in addition to its strong punch. Its eyes—which protrude from its head and move independently—can see in two different directions at once. They can also detect colors that humans are unable to see. It’s easy to be floored by this animal’s cool traits! Watch a video of the peacock mantis shrimp. Text by Andrea Silen, NGS Staff
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Howler monkeys are the loudest of all monkeys. They call to let others know where their territory is, alerting them to stay away. The calls sound like a loud whooping bark or roar. After one group of howlers call, another group answers. Howler monkeys usually do this in the morning and at the end of the day. These monkeys live in Central and South America. At home in the forest, they hardly ever leave the treetops. They don’t move very far each day, feeding leisurely at the very top of the forest canopy. Howlers mainly eat leaves, as well as fruits, nuts, and flowers. Howler monkeys get almost all the water they need from the food they eat. One of the few times they can be spotted on the ground, however, is during very dry spells when they need to find extra water. Howler monkeys have prehensile tails, or tails that can grip. The monkeys use their tails as a fifth limb to grip branches. Mostly it uses its tail to help grip branches as it eats and moves around high in the trees. Each family group is generally made up of 15 to 20 howlers. The leader is usually an old male. The head and body of adult howler monkeys range from 22 to 36 inches (55.8 to 91.4 centimeters) long and their tail can add 23 to 36 inches (58.4 to 91.4 centimeters). Though most species are classified as least concern, the Yucatán Black is endangered.
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This shark’s unusual name comes from the unusual shape of its head, an amazing piece of anatomy built to maximize the fish’s ability to find its favorite meal: stingrays. A hammerhead shark uses its wide head to trap stingrays by pinning them to the seafloor. The shark’s eye placement, on each end of its very wide head, allows it to scan more area more quickly than other sharks can. The hammerhead also has special sensors across its head that helps it scan for food in the ocean. Living creatures‘ bodies give off electrical signals, which are picked up by sensors on the prowling hammerhead. The shark hunts alone, and can find stingrays that hide under the sand on the seafloor. Hammerheads also eat bony fishes, crabs, squid, lobsters, and other sea creatures. The upper sides of these fish are grayish-brown or olive-green and they have white bellies. They have very impressive triangular, serrated teeth—like the edge of a saw’s blade. Hammerheads‘ mouths are on the underside of their heads. Unlike many fish, hammerheads do not lay eggs. A female gives birth to live young. One litter can range from six to about 50 pups. When a hammerhead pup is born, its head is more rounded than its parents‘. There have been very few recorded attacks on people by the great hammerhead.
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Honeybees live in colonies with one queen running the whole hive. Worker honeybees are all females and are the only bees most people ever see flying around outside of the hive. They forage for food, build the honeycombs, and protect the hive. Many species still occur in the wild, but honeybees are disappearing from hives due to colony collapse disorder. Scientists are not sure what is causing this collapse. Honeybees are important pollinators for flowers, fruits, and vegetables. They live on stored honey and pollen all winter and cluster into a ball to conserve warmth. All honeybees are social and cooperative insects. Members of the hive are divided into three types. Workers forage for food (pollen and nectar from flowers), build and protect the hive, clean, and circulate air by beating their wings. The queen’s job is simple—she lays the eggs that will spawn the hive’s next generation of bees. There is usually only a single queen in a hive. If the queen dies, workers will create a new queen by feeding one of the worker females a special food called „royal jelly.“ This elixir enables the worker to develop into a fertile queen. Queens regulate the hive’s activities by producing chemicals that guide the behavior of the other bees. Male bees are called drones—the third class of honeybee. Several hundred drones live in each hive during the spring and summer, but they are expelled for the winter months when the hive goes into a lean survival mode.
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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.
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Water quenches your thirst, is fun to play in, and generally keeps us alive. (Yeah, it’s kind of important.) Check out other reasons why you should love this liquid.
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A bald eagle’s white head may make it look bald. But actually the name comes from an old English word, „balde,“ meaning white. These graceful birds have been the national symbol of the United States since 1782. Bald eagles were on the brink of extinction because of hunting and pollution. But laws created almost 40 years ago have helped protect them, and they’ve made a comeback. Female bald eagles are a bit bigger than males. Their bodies can be three feet (one meter) long, and their wingspan can be eight feet (2.4 meters) across. That’s about the distance from the floor to the ceiling! Eagle nests are called aeries (AIR-ees). Bald eagles build their nests at the very top of tall trees so the eggs will be safe. Some parents come back year after year to the same nest, adding more sticks, twigs, and grass each time. Babies, called eaglets, are born light gray then turn brown. When they are four to five years old, they develop their normal white heads and tails. In the wild, they can live to be 35 years old or more. Bald eagles can soar over 10,000 feet (3,048 meters) high, and their great eyesight lets them see fish up to a mile (1.6 kilometers) away. When they attack, they drop down at up to 100 miles (161 kilometers) an hour! Then they glide just above the water, snag a fish with their feet, and fly off to eat it.
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A blob the size of a teacup slinks along the ocean floor in the shallow waters off of Australia. It’s a type of sea slug called the nudibranch (NEW-dih-bronk), a slime-oozing creature with a boneless body. Many of them also sport brilliant colors and eye-catching patterns on their skin. In fact this sticky slug is often considered one of the most beautiful animals in the world. IN THE MOOD FOR FOOD Over 3,000 species of nudibranchs exist, and most live in shallow, tropical waters. They can be anywhere from a quarter of an inch to 12 inches long and can weigh up to 3.3 pounds. These sea slugs spend their time sliding on their bellies around their habitat in search of snacks. The animals have a set of curved teeth, which they use to eat coral, sponges, and fish eggs off the ocean floor. Nudibranchs use tentacles on their heads to poke around for grub. TRUE COLORS The nudibranch’s meals don’t just satisfy its hunger—the food also gives the animal its coloring. When the sea slug eats, it absorbs and displays its prey’s pigment—the substance that gives the prey its color. Some nudibranchs also absorb toxins from certain prey and secrete the poison from their own skin. This allows them to fend off enemies such as fish. So the nudibranch is stunning, resourceful, and it recycles? This slug sounds far from sluggish! Text by Andrea Silen / NGS Staff
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