Walking round in the morning to collect some of these caterpillars to put into spirits, I observed many of the thorn trees covered with dead insects, small lizards, frogs, beetles, grasshoppers, locusts, and many other kinds, all beautifully spiked on the long mimosa thorns; nearly every bough had one or more on. I knew at once that it was the larder of the little cruel butcher-bird. The bush seemed to swarm with them, and I have watched them frequently take and spike insects. One caught a frog and carried it to a tree close to where I was concealed, to see how he managed to pierce them so securely. The frog made a kind of scream when he was being taken up, and almost a scream when the large thorn was put through him. But he was not long suspended; when the bird was gone he wriggled himself clear, and fell to the ground, and I put him out of his pain. This butcher-bird is about the size, rather larger than a sparrow, black and white. One killed two canary-birds; both were put on the thorns. They seem never at rest, always looking for game of some kind. They are known in every part of South Central Africa. The Wagt-een-beitje tree is their favourite for impaling their victims. The mocking-bird is also common; two kinds, one black and white, the other brown. The latter is the most talkative. Both night and day I have watched them on the topmost branches of the lofty trees, and their persistent and energetic mode of keeping up their everlasting talk has kept me awake many nights, as in several parts, where the wood is thick, they seem to occupy every tree and bush. Snakes are also plentiful down along the Molapo; being out one afternoon with my gun after wild ducks, walking along the banks, all of a sudden a large black mamba snake stood in my path, about ten feet distant; he had raised himself more than two feet from the ground and was coming at me; I had just time to fire into his head before he made his spring. He measured eleven feet seven inches. The poison-fangs are as long as a parrot's claws. I put him into one of these chimneypot ant-hills to feed the ants; several more I saw the same day, and many puffadders: the largest measured three feet five inches.