In the Grand Canyon,in the southwestern U.S.,there are many species of squirrels,including the Albert Squirrel and a "subspecies," the Kaibab Squirrel (isolation is not complete,according to the biological species definition by Ernst Mayr).The two populations of squirrels can interbreed to produce fertile offspring,but the populations exist on different portions of the rim of the Grand Canyon,separated by the canyon and the Colorado River.This is an example of

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The scenario described is an example of allopatric speciation, where the two squirrel populations are separated by a physical barrier (the canyon and river). The fact that they can interbreed and produce fertile offspring indicates that they are not reproductively isolated enough to be considered separate species. Therefore, it cannot be sympatric, postzygotic, or prezygotic speciation. Parapatric speciation is also unlikely because the two populations do not have any overlapping range.

In the Grand Canyon,in the Southwestern U