Bat Tree Habitat Key (BTHK) is a free web-hosted document which can be downloaded from http://battreehabitatkey.co.uk/.
BTHK comprises descriptions and accounts of how Potential Roost Features (PRF) form in trees and how bat species native to the British Isles use them. It includes accounts from the front-line of some of the rarest species provided by professional bat-workers and committed amateurs alike. Anyone can contribute as the text is updated annually. Bat Conservation Trust has recently taken over the Bat T
05/08/2026
In September 2025, a Myotis brandtii was found behind a lifting- bark feature on a dead Fagus sylvatica by Robert Bell. This finding was confirmed by a DNA swab test undertaken by Nature Metrics. Bat also seen in the roost.
17/07/2026
Somewhere in Surrey, Eleanor Sheehan found a Quercus robur with a woodpecker hole feature containing a nursery roost of up to ten Myotis daubentonii.
24/06/2026
After finding the low-level butt-rot feature with a Plecotus auritus at the same site on the same day, back in October 2025, Vicky Rusby found another Acer pseudoplatanus with a wound feature containing a Plecotus auritus.
20/05/2026
In July 2025, an emergence survey of a woodpecker hole on a Cedrus libani by Lewis Cassidy counted three Nyctalus noctula bats emerging from the feature. At least eight were seen emerging later in August.
01/05/2026
During a survey in October 2025, Vicky Rusby found an Acer pseudoplatanus with a low-level, butt-rot feature containing a sleepy Plecotus auritus.