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Sharks (superorder Selachimorpha) belong to a family of fish that have skeletons made of cartilage, a tissue more flexible and lighter than bone. Shark bodies are rounded and tapering at the ends. They breathe through a series of five to seven gill slits located on either side of their bodies.
Snakes are elongated, limbless, flexible reptiles. There are about 2,900 species of snakes. Of these, 375 are venomous.
The snow leopard, known for its beautiful, thick fur, has a white, yellowish or soft gray coat with ringed spots of black on brown. The markings help camouflage it from prey.
Snowy owls are mostly white with narrow, sparse brown bars and spots. Their golden colored eyes are rather small for an owl and their toes and claws are thickly covered with feathers.
Known as "prairie ghosts" because they are so elusive, the Sonoran pronghorn (Antilocapra americana sonoriensis) is the fastest land mammal in North America. Smaller and lighter in color than other pronghorn subspecies, it is uniquely adapted for survival in harsh arid conditions.
The swift fox is a small fox around the size of a domestic house cat and found in the western grasslands of North America, such as Colorado, New Mexico and Texas.
The thick-billed parrot is one of only two species of parrot that once inhabited the United States (the other is the Carolina parakeet, which is unfortunately extinct).
The tiger is the largest member of the felid (cat) family. They sport long, thick reddish coats with white bellies and white and black tails. Their heads, bodies, tails and limbs have narrow black, brown or gray stripes.
Vaquita (illustration), © Karel Havlicek/National Geographic Creative
The vaquita (Phocoena sinus), also known as the Gulf of California harbor porpoise, is is the smallest and rarest of the cetaceans - which include whales, dolphins, and porpoises. Vaquitas are very rarely seen in the wild.
The walrus is a large marine mammal with flippers, a broad head, short muzzle, small eyes, tusks and whiskers. Scientists recognize two subspecies of walrus – the Atlantic walrus and the Pacific walrus.

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