Why are flea larvae usually found away from an animal’s body?

Flea larvae are typically found away from an animal’s body because they require a specific environment to thrive and develop. Rather than living on the host, they inhabit the host's nest or habitat, where they feed on organic debris such as dried skin, dead mites, and the dried blood found in fecal matter produced by adult fleas.1

This environment provides the necessary nourishment for the larva to undergo metamorphosis. By residing in the nest, the larvae have access to the essential food sources required for their growth and subsequent molts before they spin a silk cocoon to enter the pupa stage.1