What type of ectoparasite is known for having sticky eggs that attach to the host?

The correct answer is based on the life cycle and behavior of head lice and body lice, which are known for their sticky eggs, commonly referred to as "nits." These nits adhere tightly to the hair shafts or clothing fibers of the host, ensuring that the eggs remain in close proximity to the host for warmth and food after hatching.

Head and body lice are obligate ectoparasites of humans, relying exclusively on their hosts for survival. The sticky nature of their eggs helps to secure the next generation directly to where they will find nourishment. This feature distinguishes them from other ectoparasites, which may not have the same method of attachment for their eggs.

In contrast, the common bed bug and bat bug produce eggs that are not sticky and tend to be laid in cracks and crevices away from their hosts. Sticktight fleas also attach to their hosts but do not lay eggs that stick; their eggs fall off the host into the environment.

Thus, the choice of head and body lice as the ectoparasite known for having sticky eggs that attach to the host accurately reflects the unique reproductive strategy of these parasites.