Monitor lizards’ huge burrow systems can shelter hundreds of small animals

Meters below the copper, sun-broiled dirt of northwestern Australia, an entire community hides in the dark. Geckos lay their eggs as centipedes and scorpions scuttle by. A snake glides deeper underground, away from the light. This subterranean menagerie is capitalizing on an old burrow, gouged into the earth by a massive lizard. 

Now, a new study shows that two different species of Australian monitor lizard dig arrays of these burrows into the earth and that the openings have a great impact on local biodiversity, providing shelter to a surprisingly wide assortment of animal life. The findings, published December 18 in Ecology, indicate that the lizards are “ecosystem engineers,” akin

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