Invertebrates
Darkling Beetle
Tenebrionidae · also called darkling beetles
At dawn on a Namib Desert dune, a darkling beetle tilts its body into the incoming coastal fog, letting droplets collect and trickle down grooves on its own back straight into its mouth, drawing a full drink from air alone in one of the driest places on the planet.
Overview
The darkling beetle, family Tenebrionidae, is an enormously diverse beetle group found in nearly every terrestrial habitat worldwide, from extreme desert to ordinary forest floor. Its fog-harvesting desert specialists, alongside the far more familiar mealworm larval stage, make it one of the most ecologically wide-ranging and practically significant beetle families on Earth.
A family spanning desert extremes and pet store shelves
Few insect families cover as much ground as the darkling beetle, whose members range from fog-drinking desert survival specialists to the ordinary mealworm sold in nearly every pet shop, a genuinely enormous span for one family to occupy.
Status
Least Concern — extremely widespread and abundant across nearly every terrestrial habitat worldwide.
Darkling Beetle: common questions
How does a desert darkling beetle get drinking water?
Certain darkling beetle species in the Namib Desert collect drinking water by tilting their bodies into foggy coastal wind, allowing condensed water droplets to collect on their back and trickle down grooves directly into their mouths, an adaptation that lets the beetle survive in one of the driest environments on Earth using nothing but atmospheric fog.
Is the mealworm actually a darkling beetle?
Yes, the familiar mealworm commonly sold as pet food and fishing bait is the larval stage of a common darkling beetle species, meaning anyone who has fed mealworms to a pet has already handled a young darkling beetle without necessarily realising the connection.
Why have engineers studied darkling beetles?
The fog-collecting adaptation of certain darkling beetle species has been studied directly by engineers interested in designing materials and structures that can harvest water from fog and humid air, using the beetle's naturally evolved water-collecting surface as inspiration for practical human water-harvesting technology.
How many darkling beetle species are there?
The darkling beetle family contains tens of thousands of described species worldwide, making it one of the largest and most diverse beetle families and allowing its members to occupy nearly every terrestrial habitat on Earth, from extreme deserts to ordinary forests and grasslands.