hat occurs in the the walruses. Whales, porpoises, dolphins, and their case of the horse. Among the smaller mammals, men- tion may be made of the desert-dwelling Yarkand jer- like afford other examples of aquatic mammals in boa and the African long-eared fox and fennec (which which the ears have… … with peculiar leaf-like organs on the muzzle, which of course, taken place quite independently. probably enable them to find their way in the dark- Animals like the otter and the sea otter, which spend ness without, or with little aid from, the sense of hear- as much of their time out of the water…
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