An adult body louse is tan to grey-white in color, with six legs and a body size that is comparable to a sesame seed, according to the Centers for Disease Control. A nymph louse that hatches from a female egg has similar... More » Health Diagnostics & Imaging

Several health and pest-control websites show images of the actual size of bedbug, including, and Most websites that have actual-size images of bedbugs also have enlarged images and descr... More » Home & Garden Pest Control Fleas & Bedbugs

A head louse has a life cycle of three stages: egg, nymph and adult. Difficult to see, nits are lice eggs and are often mistaken for dandruff or hair product. Adult female lice lay nits at the base of a hair shaft close ... More » Pets & Animals Bugs

Head lice can look like a tiny white speck in a person's hair, or upon closer inspection, they look like a very small light brown six-legged creature roughly the size of a sesame seed. Lice eggs, which are normally close... More » Pets & Animals Bugs

Body mass index, or BMI, measures the amount of body fat on adult men and women based on their height and weight, explains the Centers for Disease Control and Prevention. It is a general screening tool for health and obe... More » Health Fitness & Exercise

Key differences between the walleye and the pike include adult size and overall body color. Pickerel range in adult size from 3 to 60 pounds, while walleye grow to around 15 pounds. The walleye's overall body color is ol... More » Pets & Animals Marine Life Fish

The Mantoux tuberculin skin test works by causing a reaction in the skin of a person who is infected with Mycobacterium tuberculosis, says the Centers for Disease Control and Prevention. A health care worker injects a ve... More » Health Diagnostics & Imaging