The first horse, sifrhippus, was — at its smallest — no bigger than a modern-day house cat.
(Illustration: Danielle Byerley / Florida Museum of Natural History via the New York Times)
There are a lot of very interesting articles out there regarding how in the past, during periods of global warmth, species tended to get smaller. Now, scientists are speculating whether it is possible for this to occur now due to our climate change. Anyways, feel free to check it out if it sounds interesting to you!
