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🦦 Biodiversity and Keystone Species

Every living thing is part of a giant web. Discover what biodiversity means and meet the keystone species — otters, beavers, and wolves — that hold whole ecosystems together.

lessons

~15 min

to learn

🔬 Science

subject

Ages 6–12

level

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What you’ll learn

The Web of LifeDefine biodiversity and explain how a food web shows the connections between living things.Biodiversity is the variety of all living things in a place. A place with high biodiversity is usually healthier. Living things connect through food webs, which map who eats whom, like kelp feeding urchins that feed otters.
Keystone SpeciesDefine a keystone species and explain how sea otters keep kelp forests healthy.A keystone species has a job so important that its whole ecosystem depends on it. The sea otter is a keystone because it eats urchins, keeping kelp forests healthy. If otters disappear, urchins multiply and the kelp forest can vanish.
Nature's EngineersGive examples of keystone species that engineer or balance their ecosystems.Some keystone species change their whole habitat. Beavers build dams that create wetlands for many animals. When gray wolves returned to Yellowstone, they balanced elk numbers, helping trees, birds, and rivers recover. Each keystone keeps its habitat full of life.

Questions this course answers

What does biodiversity mean?

Biodiversity means all the different kinds of living things in a place and how they connect together.

What does a food web show?

A food web is a map of who eats whom, showing how energy moves through an ecosystem.

What is a keystone species?

A keystone species has such an important job that its whole ecosystem depends on it. Removing it can make the habitat fall apart.

How do sea otters help kelp forests?

Sea otters eat sea urchins. With fewer urchins munching on kelp, the kelp forest can grow tall and healthy.

How do beavers help other animals?

By building dams, beavers create ponds and wetlands that become homes for frogs, fish, birds, and insects.

What happened when gray wolves returned to Yellowstone?

The wolves helped balance elk numbers, so more willows and aspens grew, helping birds, beavers, and rivers.

Grounded in trusted sources

National Geographic
Britannica
Smithsonian
U.S. National Park Service

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