Nigel Cattlin / Cabbage root fly (Delia radicum) larvae with frass in damaged Oilseed rape (Brassica napus napus) root.

Jeff Foott / Saw dust (frass) at base of Lodgepole Pine tree trunk where Mountain pine beetles (Dendroctonus ponderosae) have drilled through the bark.Resin / pitch indicate the beetles' entry holes. Grand Teton N...

Stephen Dalton / Woodworm or furniture beetle (Anobium punctatum) holes with dust or frass produced by the larva. England, UK.

Stephen Dalton / Woodworm or furniture beetle (Anobium punctatum) holes with dust or frass produced by the larva. England, UK. August.

Stephen Dalton / Woodworm or furniture beetle (Anobium punctatum) holes with dust or frass produced by the larva. England, UK. August.

Nigel Cattlin / Rice leaf folder moth (Cnaphalocrocis medinalis) caterpillar of pest species in folded Rice (Oryza sativa) leaf, Luzon, Philippines

Premaphotos / Cactus / banana fly (Gymnonerius fuscus) male guarding a female while she lays eggs into the frass exuding from a beetle boring in a log, in rainforest, Sulawesi

David Weiller / Bagworm moth caterpillar (Psychidae) defecating fecal pellet (frass) from its lower opening. The larvae lies hidden within its coccon casing, decorated with pieces of leaf to protect and disguise itse...

Jussi Murtosaari / Large white butterfly (Pieris brassicae) caterpillars and frass on Sea kale (Crambe maritima). Korpo, Finland. September.

Ingo Arndt / Unoccupied or empty Honey bee (Apis mellifera) combs infested by Lesser wax moth (Achroia grisella) larvae which leave behind silk tunnels and frass as they move through and feed on the honeycomb, Ger...

Ingo Arndt / Unoccupied or empty Honey bee (Apis mellifera) combs infested by Lesser wax moth (Achroia grisella) larvae which leave behind silk tunnels and frass as they move through and feed on the honeycomb, Ger...

Nigel Cattlin / Pea moth (Cydia nigricana) caterpillar with frass and damaged peas in a mature green pea pod