Cat flea larvae feed on which substance?

• A. Undigested blood
• B. Digested blood
• C. Plant material
• D. Water

Answer: (B)

Flea larvae aren’t bloodsuckers themselves; they live in the environment and feed on organic debris there. Their main food source is flea dirt—the dried feces of adult fleas—which contains digested blood from the host. That digested blood provides the nutrients the larvae need to grow. They don’t have access to undigested blood inside a host, and they don’t feed on plant material or plain water. Understanding this helps explain why cleaning, vacuuming, and washing bedding to remove flea dirt is a key part of controlling flea infestations.