Close-up shots of the tsetse fly are seen. The commentary explains that adult flies measure from 6mm to 14mm in length and are found in habitats ranging from the rain forest to the dry savannah woodland. The species Glossina Morsitans occurs in the savannah woodlands at the end of the dry seasons; there is close-up footage of one lowering its proboscis into the skin of a man's hand. Glossina Morsitans feed on warthogs, antelopes and cattle; we see further shots of it feeding on its host, sucking up the host's blood, doubling the fly's own weight. The distinction between male and female tsetse is shown as is their mating process. A sex recognition pheromone is produced to assist mating and a male is shown attempting to mate with a decoy soaked in the pheromone solution. A detailed diagram showing the sexual organs of the female tsetse fly and the reproductive cycle is shown. The tsetse fly is unusual in that it produces only one larvae at a time. The larvae feed on milk produced by the uterine glands and moult twice as they grow, swelling to the size of the mother's abdomen. We see the mother fly give birth to the larvae, which comes out tail first.