by pearl n.
Skip this Video
Loading SlideShow in 5 Seconds..
By Pearl PowerPoint Presentation

By Pearl

186 Vues Download Presentation
Télécharger la présentation

By Pearl

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

  1. Common bottlenose dolphin By Pearl

  2. Appearance • The common bottlenose dolphin is grey in colour and may be between 2 and 4 metres long, and weigh between 150 and 650 kilograms. • Males are generally larger and heavier than females. • In most parts of the world the adult's length is between 2.5 and 3.5 metres with weight ranges between 200 and 500 kilos. • Newborn calves are between 0.8 and 1.4 meters long and weigh between 15 and 30 kilograms. • The dolphins have a short and well-defined snout; like a bottle which is why they are called bottlenose dolphin.

  3. Behavior • Common bottlenose dolphins live in groups called pods that usually have about 15 individuals, but group size varies from pairs of dolphins to over 100 or even occasionally over 1000 animals for short periods of time. • They eat mainly eels, squid, shrimp and wide range of fishes. They do not chew their food they swallow it whole. • Dolphin groups often work as a team to harvest schools of fish, but they also hunt individually. Dolphins can find theirprey by using  echolocation, which is similar to sonar. • Dolphins also use sound for communication, including squeaks and whistles given from the blowhole and sounds shown through body language, such as leaping from the water and slapping their tails on the water.

  4. Where and what • Bottlenose dolphins can be found in the warm and mild tropical oceans worldwide. •  Some bottlenose populations live closer to the shore (inshore populations) and others live further out to sea (offshore populations). • Usually offshore populations are larger, darker, and have slightly shorter fins and beaks. • Offshore populations can migrate up to 4,200 kilometres in a season, but inshore populations tend to move less.

  5. Intelligence • Bottlenose dolphins have a bigger brain than humans. • There have been many investigations of bottlenose dolphin intelligence, including tests of use of artificial language, object categorization, and self-recognition. This intelligence has driven interaction with humans. • Common bottlenose dolphins are popular in aquarium shows and television programs such as Flipper. They have also been trained for military uses such as locating sea mines or detecting and marking enemy divers, as for example in the U.S. Navy Marine Mammal Program. •  In some areas they co-operate with local fishermen by driving fish toward the fishermen and eating the fish that escape the fishermen's nets.

  6. Where they are found Red marks the places where the bottlenose dolphin can be found

  7. Look at this! This picture was taken in Taiji where a massive dolphin hunt took place in 2003.The water is red from the blood from the dolphins!

  8. Other interactions with humans • Did know that Bottlenose Dolphins are becoming extinct because of pollution, Habitat degration , Harvesting, low frequency sonar and entrapment in fishing gear. Also, human feeding of and swimming with wild animals. • Some interactions with humans are harmful to the dolphins. In the town of Taiji, Japan, some 23,000 are hunted for food annually. Also, the dolphins are sometimes killed accidentally by a by catch of tuna fishing.

  9. Breeding • Breeding and caring for young: Dolphins have many partners over a lifetime and mate all year round. • Females begin to breed from about six years of age, and have a calf every two to three years. • Calves are born throughout the year, although most are born in spring and summer after a gestation period of 12 months. • Calves are born tail first so that they do not drown and their mother quickly pushes them up to the surface for their first breath. • Calves suckle their mother's milk for up to 18 months, although they begin eating fish at about 6 months of age and remain with their mother for about 6 years.

  10. What can we do? • To help the bottlenose dolphin you could start off by taking care of your rubbish and not dropping it in the sea. • Write letters to the marine websites and tell them how you fell about the topic. • You could sign online petitions and websites to show your support. • Write letters to the government and you could talk about dolphins being part of by catches, how they are affected in New Zealand waters. • There are many more ideas to see, hop online and check out all of the things you can do.

  11. Bibliography • Wikipedia • Google images • Conservation websites

  12. Thank you for watching, I hope you enjoyed it!