After introducing food chains and food webs, this suite of four lessons looks at ecosystems, focussing on the species that can completely alter an ecosystem through their presence or absence.  These so-called 'keystone species' act like the keystone in an arch, giving an ecosystem strength and stability.  If they are removed, everything else in the ecosystem is disrupted too, sometimes to the point of destruction.

Suitable for Key Stage 2 and 3 classes, the lessons include:

  1. What is a food chain?

  2. What is meant by a keystone species?

  3. What are some other examples of keystone species?

  4. How can we use our knowledge about keystone species to help the environment?


Download Lesson Plan & Presentation (45.2 MB)

If you have found our lesson plans useful, please donate £5 to help YPTE to continue its work of inspiring young people to look after our world.

Donate £5

Thank you for downloading our lesson plans

We hope you’ll find them useful in inspiring young people to look after our world.

Continue browsing

Get notified when we publish new lesson plans

We routinely publish new lesson plans to our site. To stay up to date with the latest lesson plans enter your email address below to join our mailing list:

You are signing up to receive notifications about new lesson plans. By signing up, you are consenting to our privacy policy but you can opt out at any time.