When confronted by a shark, do not be alarmed. Sharks are "cowards" and can be sent on their way with a deft punch to the nose. As for pythons, they "make no attempt to avenge injury or offence", and taste best when boiled.
This, anyway, was what airmen in the 1950s were told by Britain's Air Ministry in a series of survival guides that have been re-issued by Penguin.
The guides, which provide an insight into a bygone era, cover survival scenarios in jungles, deserts, the Arctic and at sea, and advise what to do if forced to ditch a plane or bail out over unfamiliar terrain.
The pamphlets assume that every airman travels with cigarettes.
"When moving through the jungle, if smoking, keep the pieces of unburnt tobacco, and wrap them up in a piece of material," the instructions read.