Lice Life Cycle Actual Size at Life

Lice Life Cycle Actual Size. Life cycle image and information courtesy of dpdx. Adult head lice may be the size of a sesame seed (about 3mm long), but nymphs are much smaller, usually closer to only 0.5mm long.

How big are lice nitsliceeggs (called nits) are so small they look just like tiny specks. Life cycle image and information courtesy of dpdx. This does not usually bother the cat.

OTC Case Study Presentation Head Lice

These nits, or lice eggs, hatch in about seven to 12 days. That makes it very difficult to see nits with the naked eye. Lice are ectoparasites and spend their entire life on an animal host. Without blood meals, the louse will die within 1 to 2 days off the host.