Sunday 19 May
Greater mouse-eared bat (Myotis myotis)
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Greater mouse-eared bat fact file
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Greater mouse-eared bat description
The greater mouse-eared bat (Myotis myotis) is one of the larger European bats. Its fur is a medium-brown colour on the upper body, and greyish-white underneath. It has large ears with a very prominent tragus, the organ which is part of the bat’s echolocation system.
- Grand Murin.
- Murciélago Ratonero Grande.
- Wingspan: 350 – 450 mm
- Head and body length: 63 – 91 mm
Greater mouse-eared bat biology
This bat preys on larger insects, mainly beetles, which they hunt for about four to five hours after emerging late in the evening. They are known to forage on the ground for some of their insect prey.
Male greater mouse-eared bats are polygamous, and may have a harem of up to five females. The females form large maternity roosts in attics or caves and give birth to one offspring, usually in June. When they leave to feed, females leave their babies in a crèche and there are often several females left to guard the roost. The young bats can fly after three weeks, and become sexually mature at three months.Top
Greater mouse-eared bat range
The greater mouse-eared bat is found across central Europe and in scattered populations across southern and eastern Europe, but is threatened with extinction across the whole of its range. It used to be found in Dorset and Sussex, but was officially declared extinct in Britain in 1990, although some individuals may have returned (1).Top
Greater mouse-eared bat habitat
Greater mouse-eared bats are usually found around human settlements. They probably used caves as roosting sites, and today they hibernate in both caves and mines. They hunt in forests and adjoining cultivated areas.Top
Greater mouse-eared bat status
The greater mouse-eared bat is classified as Least Concern (LC) on the IUCN Red List. It is possibly Extinct (EX) in the UK (1). Listed under Appendix II of the Bonn Convention, Annex II of the Berne Convention, Annex II & IV of the EC Habitats Directive and Schedule 5 of the Wildlife and Countryside Act (as amended).Top
Greater mouse-eared bat threats
The greater mouse-eared bat was only discovered in Britain in 1958, and the last specimen was recorded in 1990. It is not clear why it became extinct in Britain although it is known never to have been a common animal.
One possibility is that the nursery roosts of this bat were subject to disturbance and destruction. They are extremely susceptible to the chemicals used to treat timber roofs (as are all bats), and it is possible that this process destroyed their maternity roosts.Top
Greater mouse-eared bat conservation
As this bat has been extinct in the UK for some years, work on conserving it has concentrated on preparing a plan should it ever re-colonise the British Isles. There are regular surveys of its former sites, and, as a commitment to this species, the greater mouse-eared bat is still listed in the UK Biodiversity Action Plans (UK BAPs).Top
Find out more
For more on British bats:
The Bat Conservation Trust:
This information is awaiting authentication by a species expert, and will be updated as soon as possible. If you are able to help please contact:
- Detecting objects by reflected sound. Used for orientation and detecting and locating prey by bats and cetacea (whales and dolphins).
- Mating with more than one partner in the same season.
- A soft cartilaginous projection extending in front of the external opening of the ear. In bats it is thought to aid in the location of prey by generating many echoes, but the precise way in which this works is unknown.
IUCN Red List (February, 2011)
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