What are small insect-like parasites that resemble miniature crabs called?

The correct answer refers to pubic lice, commonly known as "crabs," which are small, crab-like parasites that specifically infest the pubic region of humans. They are typically about the size of a pinhead and have a shape that can resemble small crabs, which is how they earned their nickname. These parasites feed on human blood and can cause irritation and discomfort in the affected areas.

The other options mentioned, such as bed bugs, head lice, and fleas, refer to different types of insects with distinct characteristics and habitats. Bed bugs primarily inhabit bedding materials and feed at night; head lice are known to infest the hair and scalp; and fleas are known for their ability to jump and typically infest animals. None of these have the specific crab-like appearance associated with pubic lice, making "crabs" the most accurate term to describe the small insect-like parasites in the question.