How Do Sharks Stay Afloat?

How Do Sharks Stay Afloat?

How do sharks stay afloat? The oil in their liver helps make them buoyant. Another factor helping sharks stay afloat is the fact they have cartilage, not bones. Cartilage is lighter than bone. Plus, their fins and tails keep sharks moving constantly. Make a model to observe how sharks stay afloat.
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Design a Seed

Design a Seed

From Keystone Plants and Fungi

Use the engineering design process to design a seed!

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Design a Wildlife Corridor

Design a Wildlife Corridor

From Conservation Success

Wildlife crossings provide safe passages for animals moving between habitats. Time to think like an engineer and a conservationist to design a crossing near you!

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Microbes in Action

Microbes in Action

From Microbe Adaptations

Seeing is believing! Find your own evidence of microbes.

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Follow the Sun!

Follow the Sun!

From Plant Adaptations

Grow some seeds and watch how they adapt!

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Reviews

2025 Green Earth Book Award Recommended Reading

Skipping Stones Honor Award

Skipping Stones Honor Award 2025

Children’s Literature
“This book is a fabulous way for children to learn about animals and develop a passion for protecting the environment.”

Praise for Spit Nests, Puke Power, and Other Brilliant Bird Adaptations by Laura Perdew

School Library Journal
“A cool science title for younger readers to learn about bird adaptation. Educators can use this text in the classroom; many STEAM lessons could be inspired by these funky adaptations.”

Praise for Biodiversity by Laura Perdew

Booklist
Top 10 Books on the Environment & Sustainability for Youth: 2020
“Activities and accessible text bring the importance and complexity of biodiversity to upper-elementary and middle-school students.”

Praise for Extinction by Laura Perdew

National Science Teachers Association Recommends
“This book uses the concept of extinction to teach a little chemistry, a little climatology, paleontology, biology (biodiversity), ecology, and a lot of geology. The science information is historical and current, drawing on three–dimensional learning, incorporating science practices to determine what factors affect extinction in general and specifically. The integration of concepts help bring the science alive and relevant.”

Detailed Book Description

Who's keeping the ecosystem healthy?

In any ecosystem, every species has a role to play. From towering trees and enormous whales to the smallest microorganisms, and from plants and fungi to animals and insects, each species is important to the overall health of the ecosystem. But some of those species play such vital roles that without them, the ecosystem is in danger of collapsing. These are called keystone species.

In Keystone Species: Meet the Animals Key to Ecosystem Health and Biodiversity with Hands- On Science Activities for Kids, young scientists are introduced to several different types of keystone species from around the world as they discover the crucial roles these organisms play in their ecosystems. Meet the sharks, gray wolves, beavers, American alligators, bees, flying foxes, wildebeests, bison, and coral that all play a vital role in regulating an ecosystem.

Try these science activities!

  • Map a wildebeest migration
  • Create an African savannah food web
  • Dissect a flower
  • Model ocean acidification
Available In:
Hardcover, $24.95
9781647411206
Paperback, $19.95
9781647411237
Includes: Table of Contents | Maps | Glossary | Resources | Index | Metric Conversions Chart
Specs: 8 x 10 size | 4-color interior | 128 pages
Subject: Science

TABLE OF CONTENTS

Timeline
Introduction
Chapter 1: Gray Wolves
Chapter 2: Sharks
Chapter 3: Beavers
Chapter 4: American Alligators
Chapter 5: Flying Foxes
Chapter 6: Bees
Chapter 7: Wildebeests
Chapter 8: Bison
Chapter 9: Coral
Glossary
Metric Conversions
Resources
Essential Questions
Index