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| Description: The tree in (a) shows the Artiodactyla hypothesis: Whales and dolphins are related to the ungulates, possibly as the sister group to the artiodactyls (represented by cows, deer, hippos, pigs, peccaries, and camels). The outgroup to these species is from the ungulate group called Perissodactyla (horses and rhinos). The tree in (b) shows the whale + hippo hypothesis. It is identical to (a) with one exception: The branch leading to whales is moved so that whales are the sister group to the hippos.
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