加州科学分级 · 加州科学Time For Kids G1
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Dolphins by Liane B. Onish Table of Contents What Does a Baby Dolphin Do? page 2 How Do Dolphins Get Along? page 6 How Do Dolphins Live? page 12 Glossary/ Index page 15 Comprehension Check page 16
What Does a Baby Dolphin Do? Dolphins are animals. Dolphins live in the ocean. A baby dolphin is called a calf. A dolphin calf has to learn to swim. The calf learns to go to the surface, or top of the water, to get air, too. calf Dolphins need air one or two times a minute.
A dolphin calf is three feet long when it is born. The calf weighs about thirty pounds. A dolphin calf grows quickly. The calf will grow up to be eight or twelve feet long and weigh 1,000 pounds. The calf drinks milk for a year. At five months, it can eat fish, too. Calf 3 feet Adult 8 feet Language DETECTIVE Clue: A period (.) comes at the end of a sentence. Find another kind of punctuation on page 2. Dolphins stay close to other dolphins. Dolphins are social animals. Dolphins like being in groups together. Some calves live with their parents and grandparents.
How Do Dolphins Get Along? Baby dolphins are playful. Baby dolphins play catch with bits of seaweed. Baby dolphins ride across waves. seaweed: a plant in the ocean Dolphins like to play together. A dolphin mother keeps an eye on her calf. When the dolphin mother hunts for food, other dolphins take care of the calf. These dolphins are called aunts. Like animal cubs, dolphin calves stay close together. keeps an eye on: watches over Dolphins nap near the surface in order to breathe.
Every dolphin makes a whistling sound. The sound says, "It's me! I'm here!" Sound waves help dolphins get around and stay safe. Dolphins make a sound. The sound waves hit an object and bounce back to the dolphin. This echo tells what and where the thing is. Using sound waves to find an object is called echolocation. How Echolocation Works clicks echo Dolphins hunt for fish. Dolphins use echolocation to find food in the wild. What Dolphins Eat fish squid shrimp
