3 Animals That Keep Their Whole Ecosystem Together

The video explains the concept of keystone species, highlighting their crucial role in ecosystems. It discusses the impact of grey wolves in Yellowstone, showing how their presence or absence affects the entire ecosystem. The role of elephants in forest management is explored, emphasizing their contribution to biodiversity. Finally, the importance of parrotfish in maintaining healthy coral reefs is discussed, stressing the need for conservation efforts.

Explain the impact of parrotfish on coral reefs. Why are they considered a keystone species?

Describe the concept of a trophic cascade and provide an example from the text.