According to the Lamba people of Zambia, there is a great lake of water above the dome of the sky. This lake is held back by a weir protected by guardians appointed by Lesa (God). Sometimes Lesa appoints children to guard it, and their irresponsible playing makes holes in the weir and allow the water to spill to earth as rain. When Lesa appoints grown men to guard the weir, then there is no rain.
Lightning (akampeshimpeshi) is caused by the guardians of the weir swinging and tossing their knives (imyele). The knives do not fall – if they did, the earth would be destroyed.
When a flash of lightning hits the ground, an animal descends to the ground on the end of a long cobweb. It looks like a goat, with beard and horns, but has the feet and tail of a crocodile. Usually it returns to the sky on its string of web; if the cobweb breaks, the animal will be trapped on the ground and cry like a goat. In this state it is very dangerous and might kill people, so it is mobbed, killed, and burned by the Lambas. Anyone trying to slay this beast must have protective medicine (ubwanga bwayamba) to avoid being killed themselves.
Doke, C. M. (1931) The Lambas of Northern Rhodesia. George G. Harrap and Company Ltd., London.