Ctenocephalides felis, commonly known as the cat flea, is a small, wingless insect that primarily infests cats and dogs. These fleas are about 1-3 mm long and have a flattened body, allowing them to move easily through fur. They feed on the blood of their hosts, which can lead to irritation and allergic reactions in pets. The life cycle of Ctenocephalides felis includes four stages: egg, larva, pupa, and adult. Adult fleas can reproduce quickly, laying hundreds of eggs in their lifetime. Effective control measures often involve treating both the pet and the environment to eliminate all life stages of the flea, preventing reinfestation.