Como funcionam os golfinhos

Autor: 
Editores do HowStuffWorks

Dolphins are popularly designated as small whales with teeth. They have an elongated body and it provides virtually no resistance to water. Some species have a beak like a bird snout. Dolphins travel a lot and can swim at a speed of up to 40 km / h. After pregnancy - which lasts about a year, the female gives birth to a single calf and the baby is breastfed for two years. dolphins are intelligent and playful animals. They emit a huge variety of sounds to communicate with each other. Like other toothed whales, they use echolocation (similar in principle to sonar) to avoid obstacles and locate prey.

Dolphins are intelligent and playful animals
© iStockphoto.com / Rohojamagic Dolphins are intelligent and playful animals

There are 37 species of dolphins. The gofinho commonplace is found mainly in the Mediterranean and North Atlantic. It is around 2.4 m in length, including a snout 15 cm. The common dolphin is brown and black at the top with fins and dark muzzle too - now your belly is white with yellow stripes on the side. The common dolphin travels in groups of no less than a thousand people or more. It feeds mainly on fish. dolphin usually rests near the surface of the water. Thus, it is not far from the air we need to breathe. When resting, usually the only dolphin closes one eye. Your breathing gets much slower. Still, he seems to be aware that you are breathing, unlike us humans. We need not be conscious to breathe while sleeping. Scientists also believe that dolphins (and other types of whales) sleep with one hand resting brain at a time. The side of the brain that is awake is what controls your breathing. It also controls the movements of the animal. And rest one side of the brain at a time also allows the dog can sleep under water. 's dolphin-nose-to-bottle is found in warm and temperate waters off the coast of North America. It is dark gray on top with a lighter gray below. Is about 3.7 m long and a muzzle of 8 cm. The dolphin-nose bottle-feeds on fish, squid and crabs. He can be trained to work in zoos and aquariums, and is also used in research on learning and animal communication. nosed dolphins bottlenose belong to the same family of killer whales and pilot whales. They also live and travel in groups - who may have 12-1000 animals. It is this group that dolphins also learn. The cubs learn by imitating their mothers and other adult dolphins - they dive and rise to the surface when in the company of an adult.

Dolphin-nose-to-bottle
© iStockphoto.com / Freder -nosed dolphin bottlenose

Play is also something important for the dolphin-nose-to-bottle. They like to jump and hit the tail in the water. Sometimes they can even walk backwards on the tail! The younger dolphins like to play chase each other. But if the game get out of control, the mother can intrude and end the game. nosed dolphins bottlenose hunt in various ways. As they hunt depends on where they are in right now. In the open ocean, these dolphins usually hunt in groups, forming a sort of circle around the shoal. So they are moving frantically so that the fish become increasingly close. Once the school is completely stuck in the middle of them, the dolphins take turns to eat it. When you are near the coast, dolphins tend to lead the school toward a rocky reef. Finally, a dolphin-nose-to-bottle also hunt alone. A lone hunter can hit the fish with its tail fin and then devour it quickly. 's spinner dolphins get their name due to the spin that give the air - they whirl in the air like acrobats. How can they do this? Firstly, the dolphin diving. Then they jump straight in the air (about 3 m in height). And finally they turn sometimes give up to seven spins in the same jump. Most other dolphins can turn somersaults, or turning the head to the tail. But the spinner dolphin is the only one who can rotate with the nose pointing to the sky and with the tail toward the water. 's spinner dolphins can also do stunts just to communicate with their colleagues. This way, they can tell where the fish are, or just jump for fun. They are also unusual in another way. The spinner dolphins have more teeth than any other whale - a spinner dolphin can have up to 252 teeth. 's Amazonian dolphins, porpoises or pink color , often swim upside down. Scientists still do not understand very well which is why they do it. However, the humps found in your back can help them to feel the bottom of the river to fetch food. Swim inverted - upside down - can help them see better. Although they have small eyes, these dolphins have excellent vision. And in terms of having very large cheeks, these dolphins see better when they are upside down. River dolphins usually live in fresh water or in water that is too little salt. Dolphins of the Amazon can be pink or blue-gray. They have humps instead of dorsal fins. And they have long, narrow beaks that help them in the hour of feeding.

Related Articles