and single notes; and then a great water-iguana (Polydædalus) that had been lurking on the bank in search of mice, after creeping noiselessly to the brim of the water, would plunge in with a sudden splash.
These iguanas are huge lizards, over five feet long, that generally select their habitat by water which, if not always running, at least flows periodically; they are found quite as often near human habitations as they are in the desert. Their bite is not dangerous to anything that is too large for them to devour, but they have such singular power in their long tails and in their claws, that they are able to catch many aquatic as well as land animals. Motionless as logs, with their eyes continually opening and shutting, their dark brown scaly bodies, striped with green and yellow, being of a colour to escape detection, they will for hours await the appearance of their prey with scarcely a sign of animation. Their food consists of frogs, mice, insects, or any animals up to the size of a rat, or any birds not larger than a hen.
It has been said that they are fond of the crabs that are commonly to be found in South Africa, but I am inclined to think that it is only failure of other food that induces them to drag these crustaceans from their holes, although I have seen such an accumulation of the shells as serves to show that a great many crabs may be necessary to make an iguana’s meal. No doubt they are immensely partial to eggs; and so pertinaciously do they visit hen-roost after hen-roost,
