Geoffroy's bat - population trends for Myotis emarginatus

Description

Geoffroy's bat is a rare species in Germany that closely resembles the whiskered bats. The light brown to reddish brown fur and the typical almost right-angled indentation on the outer edge of the upper third of the ear are important identification features. It is very rare in Germany, but could continue to spread in the course of climate change, if its habitats are protected.

Habitat

Climatically favored deciduous forests, scattered orchards, also in settlement areas, i.e. parks, water bodies, gardens. Structurally rich landscapes, also typically hunts in cattle sheds.

Quarters

Nursery roosts in buildings, i.e. attics of churches, private houses, cattle sheds. Seem to prefer relatively light and cool roof spaces. In southern Europe, they use warm caves. Hibernate underground in caves, cellars, mines, etc.

Reproduction

Nursery roost sizes of 20-500 females, including occasional males. Births mid-June to mid-July. Females probably sexually mature in first year. Mating: Swarming at winter roosts in the second half of August. Then hibernate until April or even May.

Size

- Head-torso length: 41-53 mm - Forearm length: 36.7-44.7 mm - Wingspan: 220-245 mm

Weight

6-9 g

Color

Appear grayish reddish brown to orange. Younger animals slightly more grayish. Underside light gray.

Nose

Pointed snout.

Ear

Light brown, typical notch on outer edge of ear.

Wing

Relatively broad.

Flight

Skilled fliers, which often also hunt e.g. in cow pens.

Ultrasonic

Frequency modulated sounds, usually begin >140 kHz and end at 38 kHz. Terminal frequencies variable, 48-30 kHz.

Endangerment

Endangered by habitat destruction. Mosaic landscapes would benefit conservation of the species. Red List of Germany (2020): endangered. IUCN (2007): Least Concern.