how big are fleas
Adult cat fleas are 1.5 to 3.2 millimeters long. Females are larger than males. Though small, fleas are big enough to see with the human eye. For comparison, a black pepper peppercorn has a diameter of 5 millimeters. Adult cat fleas typically measure 1.5 to 3.2 millimeters in length. The females are bigger than the males, with larger and heavier abdomens.