Secrets of nature: gnats

Description: Shows the life cycle of the gnat; laying of eggs in batches of two to three hundred; emergence of the larvae; structure of the larvae showing head, thorax, abdomen in ten sections; head equipped with compound eyes; feelers; bristled jaw and breathjing tube; effect of oil layer on surface of water; change to pupae; emergence of the winged insects; biting action of the female gnat.