What Causes Head Lice?
Reviewed: Dr. Gromatzky
3. Adult lice
Adult lice are considerably larger than nymphs, but are still up to only around 3 millimeters long. These adults are able to cling tightly to hair with help from 6 legs that have claws at the end. They will continue to feed on your blood, and how dark they are will depend largely on the color of your hair as they try to blend in.
When they are living on your head, most head lice will live to be around 1 month old. If they fall off then they would need to find a new host in 1 or two days otherwise they will die. An adult female louse will lay up to 6 new eggs every day she is alive.
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