TIL that when Colorado river divided the Grand Canyon’s local squirrel population, the squirrels located on both sides of the river eventually evolved into different species to the point that they cannot interbreed: Abert’s squirrel and Kaibab squirrel.

Read more: https://www.cbsnews.com/news/nature-up-close-grand-canyon-ecosystems/

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  1. The whitetail deer are also very different. If you see a buck on the south rim it’s just a small deer. On the north rim the backs are twice the size. Genetically they are a bit different, but physically they’re like a different species.

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