aliens were able to use technology to make a near-identical copy of the earth.
they used the technology to be able to have a deeper understanding of life on earth.
so, they made a copy, and chose fish, insects, and other animals to be there.
but, they only chose one land dwelling vertebrate. the hyrax.
the only difference is that this earth is in a pangea like state, so changes will be much more widespread.
more specifically, the rock hyrax (Procavia capensis), and the southern tree hyrax (Dendrohyrax arboreus). the difference between these species were originally small (the only difference being that one species is capable of climbing), but they would add up eventually..
rock hyrax
tree hyrax
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Hyracia: the world of hyraxes
Science Fictiona little thought experiment in a world where the only major land vertebrates are hyraxes.