This warbling call is an insight into the hypersonic world of small mammals, which are generally very good at keeping their world secret from ours. Photograph: Jill Mead/The GuardianPearce uses a bat detector to hear these small mammals. He has been leading an 18-month project to create “acoustic classifiers” for small mammals for the first time. Eventually Pearce wants to put acoustic recorders across London to build a complete map of small mammals in the capital. At the moment it’s hard to monitor elusive small mammals without trapping them, and many landscapes are lacking data on small mammals.

Source: The Guardian August 07, 2021 05:26 UTC