A Grey big-eared bat (Plecotus austriacus) emerging from a woodpecker hole July 6, 2014September 24, 2018 Field Work/Photography A Gray Long-eared bat (Plecotus austriacus) emerging from a woodpecker cavity. It is found only in Europe, ranging from Portugal to Moldova and from from Denmark to Greece. These bats are often solitary but form nursery colonies of 10 to 30 females. This is a relatively sedentary species that occupies a wide variety of roosts and habitats. In summer, it roosts mostly in tree cavities and buildings and may also use caves during winter hibernation. It feeds mostly on moths in lowland valleys, including in agricultural landscapes. It is very similar to the Brown long-eared bat, from which it was first distinguished in the 1960s. These bats frequently roost in woodpecker holes. View more photos in our gallery!