What is the primary food source for flea larvae?

The primary food source for flea larvae is animal feces. Flea larvae often consume the feces of adult fleas, which consists of digested blood. This dried blood is what provides the necessary nutrients for the larvae to grow and develop properly. While it is true that flea larvae will feed on organic material, the most significant source is the feces that contain these nutritious byproducts from adult fleas.

The options suggesting dried blood from the female flea or other flea larvae are less representative of the actual dietary habits of larvae. Flea larvae do not consume dried blood directly; instead, they rely on the feces that includes dried blood as a substantial component. Likewise, feeding on other flea larvae is not a typical behavior, as this would imply predatory habits that are not characteristic of flea larvae. Plant material is not suitable nutrition for flea larvae either, further confirming that animal feces is indeed the primary food source.