Nigel Cattlin / Rust red flour beetle (Tribolium castaneum) on cereal grain debris, a pest of stored crops.

Nick Upton / Bowls of Mealworms (Tenebrio molitor) ready to be fed to bats at North Devon Bat Rescue, Devon, UK, October.

John Abbott / Darkling Beetle (Tenebrio molitor) late instar larva, captive, Austin, Travis County, Texas, USA.

John Abbott / Darkling Beetle (Tenebrio molitor) captive, Austin, Travis County, Texas, USA.

John Abbott / Darkling Beetle (Tenebrio molitor) late instar larva, captive, Austin, Travis County, Texas, USA.

Stephen Dalton / Flour beetle (Tribolium castaneum) feeding on bread, UK

Stephen Dalton / Confused flour beetles (Tribolium confusum) in flour, UK

Stephen Dalton / Mealworm beetle (Tenebrio molitor) UK

Gary K. Smith / Dried mealworms (Tenebrio molitor) for wild bird food

Albert Lleal / Confused Flour Beetle (Tribolium confusum) SEM close-up view of pair eating flour at 42x magnification

John B Free / Flour / Mealworm beetle (Tenebrio molitor)

John B Free / Flour beetle larvae (mealworm) {Tenebrio molitor} UK