Green and gold bell frogs warm up inside a brick shelter. These tiny saunas could help the frogs fight off chytrid fungal infections, new research suggests.

In Sydney, where some of the remaining bell frogs reside, chytrid often flares up in the winter and early spring, when daytime temperatures may max out in the 60s.

Wedged into the tiny holes of masonry bricks, which heat their bodies up to near 30 C, you might think Australian green and golden bell frogs would be uncomfortable. But new research says the ...