HolnicoteOne corner of the estate stayed conspicuously green.

A beaver dam nearby appears to work as a natural firebreak.

Dams raise the water table across the surrounding land, and wet ground does not carry fire.

This is one estate over one summer, and researchers have not published measured figures yet.

How each outlet framed it
Phys.org
cites 2008 Elk Island study showing beaver-dam water-retention mechanism: sediment/plant accumulation sustains drought-stressed vegetation

Sources: Phys.org