Why burrowing desert animals don't inhale sand - like humans would

Why burrowing desert animals don't inhale sand - like humans would

Just how do burrowing desert animals avoid breathing in sand as they dig? Stuart Blackman explains


There’s plenty of air in the tiny spaces between grains of sand; the problem for sand-burrowing animals is how to get that air into their lungs while keeping the sand out.

Narrow nostrils help, but other clever adaptations are also needed. The Colorado Desert fringe-toed lizard, for instance, is equipped with a respiratory U-bend that traps sand before it can reach the lungs, while the sandfish, a burrowing skink from North Africa and the Middle East, has a particularly wide section of respiratory tract.

This slows down the stream of inhaled air, allowing any sand particles to fall onto a layer of sticky mucous, which is then coughed up, keeping the lungs entirely sand-free.

  • Main image: Getty Images

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