Bat Tower in East Otto, New York, USA by Joyce Hwang

Thanks to human-caused climate change, many scientists argue that the world is entering the sixth mass extinction in its history. Bats are among the species under threat. Over a million have died in the USA, where they have succumbed to a fungal infection, and in the UK, bats are vanishing as they lose their habitats and food supply thanks to non-porous buildings, pollution and pesticides, despite being protected by law. One way to mitigate these problems is to provide roosts that compensate ...