The observation that three species of grouse in Finland all experience natural population cycles every 6-7 years in synchrony is evidence that

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The fact that three different species of grouse in Finland all experience population cycles in synchrony suggests that drivers of these population cycles can happen over a large area, affecting multiple species. This is evidence of how environmental factors can impact populations and communities beyond individual species. It is not evidence of close relatedness, convergent evolution, or equal impacts from climate change.

The Observation That Three Species of Grouse in Finland All