By: sepideh keshavarz

Pages Introduction1 What is dolphin?2 How fast do dolphin swim?3 What dolphin eat?4 How big the dolphin grow?5 Do dolphin have families?6 dolphin body part!7 What's the difference between dolphin and porpoise 8 conclusion9 10

Introduction page1 Dolphins are one of the smartest animals living in the ocean. There are about 40 species of dolphins. There are thirty-three ocean dolphins, five river dolphins, and six different kinds of porpoises. They have adapted to all of the oceans of the world. Dolphins are not fish; they are mammals. Dolphins' closest land relatives are pigs, cows, and deer! Dolphins evolved in the ocean, while hoofed animals evolved on land.

What is dolphin? page2 Dolphins, like you and me, are mammals. They have teeth, are warm-blooded, have a four-chambered heart, and nurse their young from mammary glands. Dolphins also have hair — but not very much!

How fast do dolphin swim page3 We don't know how fast most dolphins swim but bottlenose dolphins typically swim at 3 to 7 miles per hour. They can go over 20 miles per hour when they work hard. The body shape of a dolphin helps it swim fast. A dolphin's body is shaped like a tube that is pointed at both ends. This streamlining helps the water flow over the dolphin's body as it swims.

What dolphin eat? page4 They eat fish. The fish that they eat include squids and crustaceans, such as shrimp. Adult dolphins eat up to 4% to 5% of their body weight per day, but a nursing mother may eat up to 8% per day. Dolphins do not chew their food. They swallow i whole. They swallow fish head first so that the spines of the fish won't catch in their throats.

How big the dolphin grow? page5 The biggest dolphin is the killer whale. Killer whale calves are about 8 feet long at birth and can grow to over 20 feet long. Bottlenose dolphins are about 3 1/2 feet long at birth and grow to 8 or 9 feet long.

Do dolphin have families? page6 The structure of dolphin groups (also called herds or pods) is more like that of elephants than humans. In killer whales the social group is formed by a female and her calves — even if they have grown to adults. The fathers of the calves do not live with the pod. We do not know what the social structure is for many kinds of dolphins.

Dolphin body part page7

Whats the difference between dolphin and porpoise page8 What's the difference between a dolphin and a porpoise? Even though they are both toothed whales, they have different body shapes. Dolphins usually have a large forehead. The easiest way to tell them apart is to look at their teeth. All dolphin teeth are round when you cut them in half. All porpoise teeth are flat.

Conclusion page9, I’m this book author my name is sepideh keshavarz I am from IRAN student of Russell sage junior high school 190 in 7 grade. I like to write book for everyone to read and enjoy, I exertion to make this book, I am searching a lot in to the internet and I am study many book to find this information and I also use easy words to understand better, my aim of this are to show you what mammals are dolphin and I also show you body parts and other thing…..