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Transcript of Dolphins
Familiar Marine Mammals North America.
Alfred A. Knopf, New York
females are cows, males are bulls, and young are calves
pods of up to 12
seen jumping, riding waves, and play fighting
blowhole to breath
excellent seeing and hearing
clicking and whistling
nets kill a large number of dolphins
This dolphin is a small, toothed whale that has a long, beaklike snout, a sickled shape dorsal fin, and sharp teeth. It's also known as the Spotted dolphin, the White-Spotted dolphin, the Brindled dolphin, the Spotter, the Spotted porpoise,and the Slender-beaked dolphin. Found worldwide in tropical seas. They grow to be 8 feet long and weigh from 200 to 255 pounds. It eats fish and squid, but sometimes crustaceans. Their predators are some sharks, orcas, and are also caught in fishing nets. They are endangered.
Pacific White Sided
The Pacific white sided has a range of coloring from light to dark gray. The underside is white. They also have black rings covering their eyes. Their beak is very small. One characteristic is that they have a hook on the end of the dorsal fin. They are about 8 feet long and weigh about 300 pounds. They live in the Pacific ocean. They are very fast swimmers. More than 50,000 of these dolphins live in the waters of Japan. Some have been found along the coast of California and some in the Bering Sea. Estimated that 100,000's of them are out there. They are very acrobatic. They eat squid and variety of fish.
Orca (Killer Whale)
Alot of people think Orcas are whales, but actually they're not. They are the largest dolphins. Their only predators are humans. Pod membors take care of the young and sick. It's called ''wolf of the sea'' because its behavior is like a wolf's. Orcas can grow to be 27-33 feet long and weighs more than 8,000-12,000 pounds. Males are larger than females. Their skin is mostly black with some white splotches. The dorsal fin of a male is taller and more upright than a females. Orcas eat fish, squid,sharks, marine mammals, turtles, octopi,and birds. Orcas have 40-52 teeth. The teeth are curved inward and are about 3 inches long and an inch in diameter, but some longer. An average sized orca will eat 551 pounds of food each day. Orcas can dive 100 feet down to catch their food. Orcas can swim up to 30 mph. Orcas live in waters from tropical to artic. They are in all the oceans and most seas and sometimes estuaries,but don't go far from the sea. Orcas migrate and may cover over 100s of miles in order to find seasonal prey.
Striped dolphins are often found in warm water. Sightings at Atlantic and Pacific oceans. Including the Mediterranean Sea. Also, staying in tropical and subtropical regions. Easily recognized with a long stripe from their rostrum down along their side to their rear flank. The underside is either white or pinkish. Striped dolphins are also darker than a common dolphin. Found in groups of anywhere from hundreds to thousands. These dolphins are active in the water.
Bottlenose dolphins are small, sharp toothed whales . They are called Bottlenose because they have a long bottle like snout. They grow to be 12 feet long. Bottlenose dolphins have a life span of about 25 years. They are found worldwide in tropical waters. They use echolocation to find their food. They prey on fish and squid. Their predators are sharks,whales, and often get caught in fishing nets.