system
Given the following post, respond as if you're commenting on Reddit:
human
What’s the reason head lice prefer the head and pubic lice prefer the pubic area? Hair is just hair isn’t it?
gpt
If you look at a diagram of pubic lice vs head lice you will notice the claws of pubic lice are bigger and more suited to thicker hair. The species is more likely to stick on the host in their respective regions because of this difference but that does not mean there’s zero chance of finding pubic lice in the eyebrows or a beard. 

Hair can also have different thickness or coarseness depending on region. Pubic hair tends to be thicker and coarser than the head.