Class 6 project
1. What makes dolphins special.
2. The most popular type of dolphin....7 to 8 lines
3. A rare species of dolphin .....7 to 8 lines.
4. Draw if unable to stick pictures. 3 pages in all.
PLEASE GIVE SOME BESTEST IDEA
Answers
Explanation:
Dolphins have conical teeth, a defined beak, a pronounced bulbous forehead, a more streamlined body, and a curved dorsal fin while porpoises have spade-shaped teeth, a rounded head and triangular dorsal fins. They are also generally smaller than dolphins.
Answer:
1. Dolphins have several highly developed forms of communication. They have a “signature whistle” which allows other individuals to recognise them. Dolphins are altruistic animals. They are known to stay and help injured individuals, even helping them to the surface to breath.
2.There are 44 species of dolphin, divided between an oceanic group and a river group, and they live all over the world. There are five types of river dolphins — the Amazon River dolphin, the Chinese River dolphin, the Ganges River dolphin, the La Plata dolphin and the Indus River dolphin.
3. baiji
Of the five species of river dolphins two, the baiji and the Indus river dolphin, are in grave danger of extinction. The baiji, which resides in the Yangtze River in China, one of the most industrialized and polluted rivers in the world, is the most critically endangered cetacean.
Extra knowledge:-
there are 10 interesting facts about dolphins:-
1. Nearly 40 species of dolphins swim the waters of the world. Most live in shallow areas of tropical and temperate oceans, and five species live in rivers.
2. Dolphins are carnivores. Fish, squid and crustaceans are included in their list of prey. A 260-pound dolphin eats about 33 pounds of fish a day.
3. Known for their playful behavior, dolphins are highly intelligent. They are as smart as apes, and the evolution of their larger brains is surprisingly similar to humans.
4. Dolphins are part of the family of whales that includes orcas and pilot whales. Killer whales are actually dolphins.
5. Dolphins are very social, living in groups that hunt and even play together. Large pods of dolphins can have 1,000 members or more.
6. Depending on the species, gestation takes nine to 17 months. After birth, dolphins are surprisingly maternal. They have been observed nestling and cuddling their young.
7. A dolphin calf nurses for up to two years. Calves stay with the mothers anywhere from three to eight years.
8. Dolphins have acute eyesight both in and out of the water. They hear frequencies 10 times the upper limit of adult humans. Their sense of touch is well-developed, but they have no sense of smell.
9. Dolphins have few natural enemies. Humans are their main threat. Pollution, fishing and hunting mean some dolphin species have an uncertain future. In 2006, the Yangtze River dolphin was named functionally extinct.
10. Because dolphins are mammals, they need to come to the surface of the water to breathe. Unlike land mammals that breathe and eat through their mouths, dolphins have separate holes for each task. Dolphins eat through their mouths and breathe through their blowholes. This prevents the dolphin from sucking up water into the lungs when hunting, reducing the risk of drowning.