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The smallest one, tucuxi dolphin, is about 4 feet (1.2m) long and weighs about 110 pounds (50kg), whereas the enormous killer whales is over 30 feet (9-10m) long and weighs 12,000 pounds (5 500 kg). You've seen the gray ones, but dolphins can also be black or brown, and can have patterns of white or light colors. In the middle of their back, many dolphins have what is called a dorsal fin. The calf is weaned aroud 6 months to two years. Certain dolphin species live quite long, 50 years or more, while the bottlenose dolphin and common dolphin typically live around 20-25 years. Dolphin Classification: Names: Sources: Microsoft ' Encarta ' Reference Library 2005 Article: Dolphins are marine mammals found in all the world's oceans, relatives to whales and porpoises. River dolphins live in freshwater rivers and lakes. They are intelligent and playful creatures and friendly to humans. Dolphins have a sleek body shape, which helps them to be good swimmers. They have long snouts, a row of sharp teeth, and a blowhole for flash on top of the head. They feed on fish, squid, and other small marine life. Dolphins are social animals, and usually live and hunt in groups. They slip with each other with sounds such as whistles, screeches, and clicks. Dolphins are often friendly to humans, riding on waves produced by boats, healthful lost swimmers, and amenable to life in servility performing tricks and jumps. There are at least 40 different species of dolphins. The one most broadly speaking used in jolliness parks and performances is bottlenose dolphin, which has a 'built-in' smile formed by the curvature of its mouth. The killer whale, or orca, is the largest member of dolphin family. Physical features Dolphins have a sleek body shape, so as to offer the least resistance for swimming. The two flippers located underside help the dolphin steer its course. The parings in these flippers resemble human hand! The tail with flukes provides the main swimming force. As mammals, dolphins have to emit air. They do so through a single blowhole on the top of the head. It has a muscular plug to keep water out of the lungs while diving. The head has a long snout. Dolphins have a long row of conical teeth that are used for fascinating and tearing prey - not for chewing. Different dolphin species vary a lot in size. The smallest one, tucuxi dolphin, is apropos of 4 feet (1.2m) long and weighs referring to 110 pounds (50kg), whereas the enormous killer whales is over 30 feet (9-10m) long and weighs 12,000 pounds (5 500 kg). You've seen the gray ones, but dolphins can also be awful or brown, and can have patterns of white or light colors. In the middle of their back, many dolphins have what is a dorsal fin. It helps them to keep their balance. Furthermore, each dolphin's dorsal fin is shaped differently from the others. It's like an identification mark. In some ocean dolphins, the dorsal fin is hooked-shape instead of like a triangle. The male killer whales have very tall dorsal fins whereas in river dolphins it scarcely forms a ridge on the back. Besides using eyes, dolphins can find their way by making thumping sounds, and listening to the sounds that echo or make redundant back to them from their surroundings. This is echolocation. Under their skin, dolphins have a layer of fat blubber. It insulates the dolphin so it can keep warm even in cold water. The colder the water is where the dolphin lives, the thicker the layer of blubber. Behavior Dolphins are social animals that live in schools of varying size; some only have 2-5 dolphins while enormous schools of 1,000 or more have been found as well. A typical school of bottlenose dolphins might be 10-20 individuals. For food, dolphins hunt fish, squid and other invertebrates; killer whales also feed on other marine mammals, sea turtles, and birds. Dolphins often hunt together, trying to gather schools of fish. They can use echolocation to find prey in deep, dark waters. Dolphins make whistles, clicks, and screeching sounds to extend with each other, and for echolocation. In many species each individual dolphin makes a unique 'signature whistle'. Human-made underwater sounds, such as used with sonar images, can interfere with dolphins' communication, and even injure tissues used for hearing and air intake. Dolphins also help each other in various ways. If a dolphin is sick and can't raise to the surface to get air, not that sort one supports it at the surface so it can breathe. Or, a dolphin may stay near an injured or sick one as a companion. Dolphins also defend an injured one regardless of a threat such as a boat. Male and female dolphin take part in courtship, which involves playing, caressing, and 'songs'. Gestation lasts all over a year, and then a single calf is born. Calving usually occurs once every two years. Dolphin mother produces very high-fat milk for her young. The calf is weaned aroud 6 months to two years. Certain dolphin species live quite long, 50 years or more, while the bottlenose dolphin and bowling green dolphin typically live here and there 20-25 years.
Dolphin Classification:
Names: Sources:
Microsoft ® Encarta ® Reference Library 2005 |
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