Scalp Lice. Human head lice inhabit only one habitat on the planet. The human scalp. Four top reasons that head lice like the human scalp. 1. The scalp is warm, kids scalps are even warmer than adult scalps. 2. The scalp has a steady source of food for a head louse. Head lice need blood meals every 3-4 hours. 3. The scalp is humid. Head lice dry out if not in an environment with high humidity. 4. The scalp is dark. Under all of the layers of hair, it is nice and dark and this makes head lice and their eggs (nits) more difficult for humans to see, increasing the likelihood that the lice colony will not be detected or eradicated.
Scalp Lice. Why don’t human head lice like dogs? 1. Most dogs have fur, not hair.Dogs are constantly shedding their fur. This would not work for head lice, because if a nit got laid on a strand of dog fur, and that strand fell of the dog in a shedding, the nit would be too cold to mature and hatch. 2. Dog fur is shorter than hair on human scalps, making dog fur colder and less humid and brighter than human hair. 3. Dogs don’t regularly curl up together in a pile in order to allow head lice to travel from one scalp to another. Most dogs in our culture are solo pets and do not cuddle with other dogs. Whereas in human culture in 2016, our children curl up together to watch a movie on Mom’s ipad. If their scalps are in prolonged contact, the head lice will happily walk right over to their new host.