Sepideh Keshavarz

Pages

Introduction 1

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

conclusion 9

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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.

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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.

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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

What's 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

• In conclusion dolphins are warm blooded and intelligent mammals and Sometimes dolphin swimming can cause huge uproars within the local community because there have been problems in the past. Humans more out of natural curiosity rather than wanting to harm, get too close for comfort and with some dolphins, this can make them feel very uneasy and may result in them lashing out.

I’m the author of this book. My name is Sepideh Keshavarz. I am from Iran, and a student of Russell Sage Junior High School 190 in 7th grade. I like to write books for everyone to read and enjoy. work very hard to make this book, I am searching a lot in to the internet and I am study many books to find this information and I also use easy words to understand better. My aim of this book is to show you what are dolphin and to learn more about dolphin Thank you