![Galapagos Wildlife: Galapagos Tortoises © Caroline Pannell](https://www.discoveringgalapagos.org.uk/wp-content/uploads/2014/02/Caroline-Pannell-Reptile1-1024x681.jpg)
Galapagos giant tortoises are a keystone species © Caroline Pannell
A species that when its population size changes, has a large impact on the whole of its ecosystem. A keystone species plays a crucial role in maintaining the health and stability of its ecosystem, despite not being the most abundant species in that ecosystem. The Galapagos giant tortoise is an example of a keystone species.
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