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Beavers are the largest rodents (gnawing animals) in North America and the second largest in the world, behind the South American capybara. Beavers are powerful swimmers that can swim underwater for up to 15 minutes. As the beaver dips underwater, the nose and ears shut to keep water out. Transparent inner eyelids also close over each eye to help the beaver see.
Comeback critters See how animal species in trouble have come back from the brink

Get the inside scoop on how these brown bears pack on the pounds to prepare for winter, and see before-and-after pictures of fat bears!
That’s why they have to constantly chow down in the months before their light hibernation

These creatures are all ears! Check out the incredible listening devices of the animals in these photos.
Listen in as Mother Nature explains why some creatures have some super-freaky traitsâ

Christmas Island red crabs are famous throughout Australia and the world for their bright red color and for their spectacular annual migration to the sea. Millions of crabs become rivers of red as they move from the island’s interior rainforests to the ocean to breed and lay eggs. During migration, red crabs climb over and around obstacles in their way, following the same migration paths every year. Christmas Island red crabs live on Christmas Island in the Indian Ocean off Australia’s northern coast, about 240 miles (380 kilometers) south of Java, Indonesia. Red crabs must keep their bodies moist, so they wait for the rainy season to provide conditions that are ideal for the difficult journey. A single female can lay up to 100,000 eggs.
Comeback critters See how animal species in trouble have come back from the brink

There are more than 4,000 species of frogs. Hop to it and check out a few ribbit-ing photos of these totally awesome amphibians.
Listen in as Mother Nature explains why some creatures have some super-freaky traitsâ

Learn the science behind how earthquakes happen—and how you can stay safe if one hits.
• Ask your parents to make sure you have an emergency kit containing things like

Spain occupies most of the Iberian Peninsula, stretching south from the Pyrenees Mountains to the Strait of Gibraltar, which separates Spain from Africa.
Recent immigrants from North Africa and Latin America have added to the mix.

Sweden is in the geographical region known as Scandinavia in northern Europe.
Under their system, all Swedes have access to publicly financed health care, help

Brazil is the largest country in South America and the fifth largest nation in the world.
For thousands of years, people have been exploiting the jungles of Brazil.

During the mating season, male blue-footed boobies strut around with exaggerated movements that show off their fabulous blue feet. Females tend to pick the males with the bluest feet as their mates. Parents take care of their chicks feeding and protecting them—until they’re about two months old. At that point, young boobies can survive on their own. Blue-footed boobies sleep at night, generally on land, and feed at sea during the day. Sometimes boobies feed in a group. They often fly far out to sea to look for their prey—small fish such as anchovies. The birds either zip underwater for fish from a floating position on the water’s surface or make awesome dives from as high as 80 feet (24 meters) in the air. Once it spots a school of fish, the bird folds those wings back, becoming a streamlined, torpedo-shaped predator. The booby dives into the water among the school of fish, using its long beak to grab dinner.
Comeback critters See how animal species in trouble have come back from the brink