The lynx and snowshoe hare populations of Canada show regular cycles every 10 years or so.
These cycles seem to be driven by inter-dependent predator-prey relationships.
- The hare population size grows,
- providing more food for the lynx,
- which then reproduce at a higher rate,
- causing them to eat great numbers of the hares,
- thereby reducing the hare population (and the lynx's food source),
- causing the lynx population to crash,
- enabling the hare population to grow again.