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The ostrich is the tallest and the heaviest of all birds. While the huge ostrich is a bird, it does not fly. Instead it runs. One stride can cover up to 16 feet (4.9 meters)—about the length of a mid-size family car! The bird is speedy, too. It can run just over 40 miles (64 kilometers) an hour for a short distance, and can keep up a speed of more than 30 miles (48 kilometers) an hour over longer distances. The ostrich uses its short wings for balance, holding them outstretched when it runs. Strong legs can also be used for self-defense. An ostrich will kick with a force mighty enough to kill a lion. When danger approaches, an ostrich will often lie low to hide, stretching its neck along the ground. Its feather colors blend with the sandy soil where it lives. From far away, it looks like the ostrich has buried its head in the sand. Many people thought that was what ostriches did when they were trying to hide, but that is a myth. Ostriches live near grazing animals such as wildebeest, antelopes, and zebras. The grazers stir up insects and rodents for the ostriches to eat, and the ostriches warn the grazers to dangers such as approaching lions. An ostrich group, called a herd, numbers about 12 individuals. Male ostriches compete for control of a group of several females. A herd has a dominant male and a dominant female. She mates only with him, though he may mate with other females as well. All the egg-laying females, called hens, lay their eggs in the nest of the dominant female. Then that female—whose eggs are positioned in the center of the nest, the most well-protected spot—and her mate take care of all the eggs in that one nest. Each egg can be up to 6 inches (15 centimeters) long and weigh 3 pounds (1.5 kilograms)!
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Green sea turtles are the world’s largest species of hard-shelled sea turtle. While most individuals weigh about 300 to 400 pounds (136 to 181 kilograms), some can be as heavy as 440 pounds (204 kilograms). These turtles are found nesting along the coastline of more than 80 countries, with the largest nesting populations found in Costa Rica and Australia. Green sea turtles spend most of their lives underwater, where they can rest for up to five hours at a time before coming up for air. When active, they typically alternate between being underwater for a few minutes and coming up to the surface to breathe air for a few seconds. Green sea turtles are also known to sunbathe on land. Unlike most other sea turtles, adult green sea turtles eat a primarily plant-based diet consisting of seaweed and sea grass. Scientists believe these green foods give the sea turtle’s fat its green color. The shell of the green sea turtle is usually shades of a brown or olive color. Similar to other sea turtles, green sea turtles migrate long distances between their feeding grounds and their nesting sites, with recorded distances longer than 1,615 miles (2,600 kilometers). They have strong paddlelike flippers that help propel them through the water. Female green sea turtles leave the water in order to lay eggs on the beach and will choose the same nesting spot as where they were born. A female will dig out a nest with her flippers and lay a clutch of about 115 eggs. Then she’ll cover the eggs with sand and return to the sea. After about two months, the babies will use a special “egg tooth” to break their shells and hatch from their eggs. The first few years of a green sea turtle’s life are spent floating at sea, where they feed on plankton. As they grow older, the turtles move to shallow waters along the coast, such as bays and lagoons, where they find sea grass to eat. Adult green sea turtles face many threats, primarily from humans, including injuries from boat propellers, being caught in fishing nets, pollution, and poaching. Newly hatched sea turtles are also at risk of being hunted by animals such as birds, crabs, and raccoons as they move from their nests out to the sea.
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See pictures and read about Badlands National Park on National Geographic Kids.
Back then, the region was covered by ocean water.

The historic movement carried thousands of enslaved people to freedom. This is their journey.
To be captured would mean being sent back to the plantation

These seabirds are known for their wild look and sound—no wonder they’re sometimes called the rock stars of the penguin world.
critters See how animal species in trouble have come back

What’s the problem?
from other types of waste—it doesn’t decompose back

Dig up secrets about this buried ancient civilization.
FOUND Visiting the ruins of Pompeii is like going back

The kids who attend Explorer Academy—an exclusive school for explorers—have been involved in some, um, unique circumstances. If at least one of the descriptions below applies to you, you might be enrolled at this supercool school. (Lucky you!)
YOUR FRIENDS TOTALLY HAVE YOUR BACK—AND YOU HAVE THEIRS

A snow leopard peers down from a craggy rock ledge high in the peaks of Mongolia, a country in Asia. She’s on the lookout for a snack. The animal’s spotted beige fur allows her to blend in almost completely with the rocks, making the cat a nearly invisible hunter. Noticing a wild goat grazing below, the feline creeps across the ledge on her silent, furry footpads. Then she rockets down the slope. The wild goat scrambles to escape. But with one 30-foot leap the cat catches up and pounces. Seconds later, she’s secured her meal and looks for a place to dine.
critters See how animal species in trouble have come back

You might use plastic water bottles, yogurt cups, and straws for just a day, but they can remain in the environment for years. And that pollution can harm habitats and the animals that live there. Cut down Earth’s trash with these tips.
Stephan Bonk, Shutterstock Balloons eventually fall back