Question: What sub-Saharan African mammal is the third-largest type of land mammal and a large concentration of them can be found at the Kazinga Channel?
Sentence (from "Hippopotamus"): Despite their physical resemblance to pigs and other terrestrial even-toed ungulates, the closest living relatives of the Hippopotamidae are cetaceans (whales, dolphins, porpoises, etc.) from which they diverged about .
Relevant evidence: No