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A red-bellied piranha calmly swishes through a river. Suddenly, it spots dinner: a shrimp swimming nearby. The fish glides closer and opens its mouth to reveal rows of razor-sharp, triangular teeth. Then it snaps up its prey in its powerful jaws and swallows the shrimp whole. Finished with its first course, the fish swims off in search of more food. ON THE HUNT Red-bellied piranhas live in lakes and rivers in South America. They sometimes use their mighty mouths to gobble up other fish or animals such as shrimp, worms, and mollusks. They swim and hunt in shoals, or schools, that can include more than a hundred individuals. According to legend, the animals, which can grow about 14 inches long, have even devoured human swimmers. MISUNDERSTOOD FISH Despite their big bite, scientists believe that the animals’ fearsome reputation has been exaggerated. Researchers think that these fish swim in groups for protection, not to carry out underwater takedowns . And reports of the fish going after humans are extremely rare. When some red-bellied piranhas do get aggressive, they have an interesting way of telling others to „back off“—they make bark-like sounds! Guess these guys are all bark, and just some bite. Text by April Capochino Myers
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Black-tailed jackrabbits are not actually rabbits, but are hares. Hares are born with fur and are larger than rabbits. They usually have taller hind legs and longer ears. These speedy animals are capable of reaching 40 miles (64 kilometers) an hour. They have powerful hind legs that can propel them on leaps of more than 10 feet (3 meters) . They use these leaps and a zigzag running style to evade their many predators, including coyotes. Jackrabbits produce a lot of young called leverets or bunnies. Females give birth to several litters a year, each with one to six young. The young mature quickly and require little care from their mothers. While the endangered status of most species is least concern, the Tehuantepec jackrabbit is considered near threatened. Other species of jackrabbits live in Mexico, the United States, and Canada.
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This 4-inch-long (10-centimeter-long) fish shares an amazing partnership with another sea creature: the anemone (pronounced: uh-NEM-uh-NEE). The partnership benefits both participants, and the close relationship led to the fish being named an anemonefish. Anemones have tentacles that sting, but the clownfish isn’t bothered by them. In fact, it lives among the tentacles. Living among the tentacles of the anemone, the clown anemonefish gains protection from predators—which don’t dare get near the stinging protector. The anemonefish also gets to eat leftovers from the anemone’s meals. The anemone benefits from having the fish around, too. The useful fish nibbles away parasites that bug the anemone. And sometimes the anemonefish brings food into the tentacles which the anemone can also eat. Generally several anemonefish make one host anemone their home.
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Hedgehogs have prickly spines everywhere except on their face, legs, and bellies. By curling into a tight ball and tucking in their heads, tail, and legs, they protect the parts of their bodies that do not have stiff, sharp spines. Often compared to pincushions, hedgehogs depend on their spines for defense—both while they sleep and when they face enemies. The head and body of adult hedgehogs range from 5 to 12 inches (13 to 30 centimeters) long and their tail can add 1 to 2 inches (3-5 centimeters). When hedgehogs are born—up to seven in a litter—their spines are soft and short. Soon after birth, their spines harden, becoming stiffer, sharper, and longer. Babies stay in the nest until they’re about three weeks old. By that time, their eyes are open, their spines are effective, and they can safely follow their mother outside the nest as she looks for food. Top on the hedgehog’s menu are insects, followed by small mice, snails, lizards, frogs, eggs, and even snakes. Hedgehogs sometimes add extra protection to their spines by „self-anointing.“ Immune to poisons in some plants, hedgehogs sometimes eat those plants and then make a frothy saliva in their mouths. The hedgehogs then lick their spines, spreading the saliva with the plant’s poison all over the spikes. Though hedgehogs mainly stay on the ground, they swim quite well and even climb trees.
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A tree stands in a forest under a cloudy sky. Suddenly it appears as if a twig is crawling down the trunk. The object isn’t actually a twig that’s sprung legs—it’s a stick insect. The stick-like trickster uses its appearance to protect itself from enemies so it doesn’t end up in, well, a sticky situation. FOOLED YA Stick insects—also known as walking sticks—live in tropical and temperate (or mild) forests all over the world. Related to grasshoppers, crickets, and mantises, these creepy-crawlies are usually brown, green, or black. They’re also the world’s longest insects. The largest one ever found stretched 22 inches with its legs extended. (Most are only up to 12 inches long.) This bug spends much of its time in trees, munching on leaves. When predators such as birds approach, the insect tries to remain completely still in order to blend with the branches. If a predator isn’t fooled and grabs the bug by the leg, it’s no big deal. The insect can detach the leg and scuttle away. It will later regenerate, or grow back, the lost limb. A GOOD EGG About 3,000 species of stick insects exist. Some are master mimics even before they hatch. The females from these species lay eggs that look like plant seeds. This prevents carnivorous insects from eating the eggs. This crawler really knows how to go undercover. Text by April Capochino Myers
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Northern Mockingbird
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Bull sharks are among the most dangerous sharks in the world, according to many experts. This is because they’re an aggressive species of shark, and they tend to hunt in waters where people often swim: along tropical shorelines. Bull sharks live throughout the world, in shallow, warm ocean waters. They’ve been known to swim up into freshwater rivers. Humans are not part of a bull shark’s normal prey. Bull sharks will eat almost anything, but their diet consists mainly of fish. They also sometimes eat dolphins and sea turtles. Bull sharks even eat other sharks. They hunt during the day and at night. Sharks must keep salt in their bodies to survive, and most can live only in salt water. But bull sharks have developed special adaptations—the way their kidneys function and special glands near their tails—that help them keep salt in their bodies even when they’re in freshwater. Scientists are still studying these sharks to figure out why they developed this unusual ability.
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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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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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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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