Salamander

Brightly Colored: : Salamanders come in a variety of colors and patterns, with bright colors usually a warning to predators that this menu item contains a lethal poison.
A Disposable Tail: They have slender bodies, usually four legs of similar size, a small head, small eyes and a tail. In some species the tail detaches when attacked. The tail will continue to twitch, distracting the predator as the rest of the salamander makes its escape.
Land and Water: Some species of salamander make their home in water, while others are mainly terrestrial. Those that make their home in water take in oxygen through large external gills.

Frog

Frogs vs. Toads: Frogs and toads are amphibians, meaning they start off as water-breathing juveniles and develop into air-breating adults. No clear distinction exists between frogs and toads, although the skin of a toad tends to be rougher and drier than frogs. Toads also tend to be covered with warts.
Deadly Tongue: Both critters are characterized by their short, ridged body and wide head. Large protruding eyes and a noticeable eardrum on each side of the head are always on the alert for the next meal. A large mouth houses a long, sticky tongue that quickly flicks out to capture live prey. Without teeth and unable to chew, a frog's meals are swallowed whole.
Vulnerability and Defense: Frogs and toads are very vulnerable as they have no defenses against predators. Their best bet to escape being eaten is their ability to jump quickly or their talent for blending into their surroundings. Some species have evolved glands that secrete a poisonous and distasteful substance on their skin. These animals are usually brightly colored to give warning to a predator ready for a meal that it best look elsewhere

Polar Bear

Bear of the Sea: The semiaquatic polar bear was once considered to be nomadic, but has since been shown to have a very large home range — up to about 115 square miles. Ringed seals are their preferred prey, but in winter, they will eat anything they can catch. In summer, they eat leaves, berries and seaweed.Adapted for Cold: Polar bears are made for the cold. Their hairs are hollow, making for excellent insulation that is capable of trapping much of their body heat. Only the nose and eyes radiate heat, so they cover them with their paws when they sleep.The Polar Bear's Downfall: This adaptation to freezing temperatures may be the polar bear's downfall at this time of global warming. As the earth heats up due to human-created greenhouse gases, the ice has begun to melt, putting the existence of the polar bear in jeopardy.

Seal

Acrobats of the Sea: A member of the pinniped family, seals are aptly suited to their watery environment. With streamlined bodies, eyes that see well underwater, ear passages and nostrils that clamp shut while underwater, and insulating blubber, they are the acrobats of the sea.All Shapes and Sizes: Seals come in many different shapes, sizes and colors, and can be found in a variety of ocean habitats. The largest pinniped, the male southern elephant seal, can weigh as much as 5 1/2 tons. Its distinctive nose, which resembles an elephant's trunk, inflates when roaring to ward off male rivals during breeding season. The weddell seal uses its long upper incisor teeth to bite holes in sheets of ice to create breathing holes after its one-hour dive to find fish and squid.

Dolphin

It's In the Teeth: The toothed whale group, of which the dolphin is a member, also includes river dolphins, porpoises, white whales, sperm whales, orcas and beaked whales. Unlike baleen whales, which scoop large quantities of water into their mouths and filter out mass quantities of food, dolphins capture their prey individually. Their conically shaped teeth are perfect for catching fish, squid or other whales.
Clicks and Echos: All toothed whales use echolocation to find and kill their prey as well as to avoid obstacles. High frequency clicks are emitted from the blowhole. A fluid-filled sac on the top of its head and just forward of the blowhole changes shape as the dolphin focuses the clicks. Bouncing off objects the clicking sound returns and passes through the dolphin's jaw. The time it takes for the sound to make its way back to the dolphin reveals the size and location of the object.

Shark

Shark Hallmarks: Although the great white shark is probably the most famous of this group of talented hunters and voracious eaters, sharks come in many different sizes, shapes and colors. In general, however, the torpedo-shaped body and sharp rows of teeth are the hallmarks of the shark.
Exceptions to the Rule: Some exceptions are the frill shark, a deepwater species, which resembles an eel more than a shark. Another variation is the pygmy shark, which grows no larger than 10 inches in length. The pygmy has light-producing organs on its belly and sides. It is thought that this its luminescence eliminates shadows, making this shark difficult to see when attacking its prey.
Hunting Techniques: Different species also depend on different tactics for hunting and killing. Some sharks rely on short high-speed chases. Other species prefer to wait for sedentary fish to come their way, and still others are scavengers on the look out for carcasses.
In Decline: The popularity of shark fishing and shark as food have had an impact on populations. About 100 million sharks are caught annuall

Turtle

An Ancient Animal: Turtles came into being about 200 million years ago and have evolved little since then. All turtles lay their eggs on land, even if the water is where they'd rather be.
Ultimate Protection: The turtle's most distinctive characteristic is the large shell that protects the soft body. Shells come in different shapes and textures depending on the lifestyle of the turtle. Those living on land have hard, high-domed shells that are difficult to penetrate. Turtles living in water tend to have more streamlined, smoother shells for easier mobility through the currents.
Famously Slow: Famously slow movers, most turtles will wait until their food inadvertently swims or walks within snapping distance. Most are herbivores and graze on grass, plants, bushes and shrubs, although they will also eat small animals or insects that happen to be mixed with their food.