crocodile

River crocodiles have pigs' eyes, large teeth and tusks, and
strong nails, and an impenetrable skin composed of scaly plates.
They see but poorly under water, but above the surface of it with
remarkable acuteness. As a rule, they pass the day-time on land and
the nighttime in the water; for the temperature of the water is at
night-time more genial than that of the open air.