BUND Fledermauszentrum Hannover
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BUND Fledermauszentrum Hannover
Die Zeichnung zeigt zwei Fledermauskästen, einen Ganzjahreskasten und einen Sommerkasten // The drawing shows two bat boxes, a year-round box and a summer box Fledermauskästen // Bat boxes  (Carina Bach / www.bund-fledermauszentrum-hannover.de)

Bats are among the most threatened mammals be. The preservation and the creation of quarterss is one of the most important tasks. Here we will show you how to offer bats quarters in house and garden. Please note, however, that the artificial quarterss are no substitute for natural quarterss, but merely serve as a supplement. The preservation of natural quarters is very important! 

Which quarters are possible?

Die Zeichnung zeigt ein symbolisch ein Fledermaushaus als Zuhause für die Fledermäuse // The drawing symbolically depicts a bat house as the home for the bats Schenk den Fledermäusen ein Zuhause // Give a home to the bats  (Carina Bach / www.bund-fledermauszentrum-hannover.de)

1. If you have trees with holes or branches with cavities in the garden, please be sure to save these natural quarters for bats. (For detailed information see the tree-dwelling bats).

2. There are different versions of commercial bat boxes, depending on the type of bat. Boxes can be mounted on the facade or on trees.

3. It is also possible to install bat quarters directly in the facade or insulation

4. To open roof spaces for bats, a bat-entrance can be left open in the unused attic space. Also in attics sometimes the small part of the roof remains unused: This is sufficient to provide bats a quarter. The attic may not be accessible to martens, cats and even owls. Please note, once you opened space for the bats, you cannot just close it later, because bats could be sealed. 

Where and how should the bat boxes are attached to the house?

Das Foto zeigt ein Haus mit mehreren Fledermauskästen an der Fassade // The photo shows a house with several bat boxes on the facade Haus mit Fledermauskästen // House with Bat boxes  (Dr. Renate Keil / www.bund-fledermauszentrum-hannover.de)

It is advantageous if you offer several boxes for bats to different sides of the house. Then, the animals can choose their quarters depending on tempeture change and neighborhood. But even just one box already offers more animals, often crowded next to each other, shelter. The boxes must be affixed or built into the facade. The bats should approach the boxes on a free way (no bushes on front of the entrance). It is essential to ensure that martens and cats can not reach the boxes. The boxes should be at least 13 feets above the ground. If you are unable to provide this high, the boxes should be fixed as high as possible. The entrance of bat boxes has a rough surface, so that the animals can crawl better. In addition, the box should have a bevel at the entrance or becompletely open from the bottom side, so that the droppings can fall off the boxes and does not seal the entrance! Round boxes, as a substitute for tree holes, must be cleaned, if necessary. The cleaning should be done once or twice a year. Cleaning should be done in April and / or September, so you don't disturb the animals during winter sleep or baby-time. Please make sure, that no animal will be pinched by opening or closing the boxes! Please refrain in the garden / balcony the use of pesticides. 

If possible please offer quarters on different sides of the house

Das Bild zeigt ein Aquarell einer Landschaft mit Bäumen und Wolken am Himmel - gemalt von Margarete Becker Aquarell "Himmel" (Sky) von Margarete Becker  (Margarete Becker / www.bund-fledermauszentrum-hannover.de)

Because the animals need different quarters depending on the season and weather conditions , it is good for them to install quarters on several sides of the house. If quarters are on different sides of the house the animals are looking for the most comfortable tempered quarter depending on weather conditions. 

How to build a bat house?

Das Foto zeigt den Bau von Fledermauskästen // The photo shows how to build bat boxes Bauen von Fledermauskästen // Building bat boxes  (Gudrun Becker / www.bund-fledermauszentrum-hannover.de)

There are now countless instructions on the internet you can download. For the construction of the boxes sawn wood should be used. Please do not use toxic wood preservative, but environmentally-insoluble agents such as linseed oil. The insides of the boxes should be left untreated. The box must remain breathable so it does not mold. For the roofing you should not use tar paper, as these melt and the bats can clog. If you don't want to build any box yourself, you can of course also purchase one. 

When will the bats come to the quarters?

Das Foto zeigt zwei Breitflügelfledermäuse Eptesicus serotinus // The photo shows two bats Eptesicus serotinus Breitflügelfledermäuse Eptesicus serotinus  (Dr. Renate Keil / www.bund-fledermauszentrum-hannover.de)

This can be very different, in some boxes you will find bats within a few days, others remain empty for many years. Many bats spend only a day or two as a guest, so the use of the box is not proven. 

How can I watch the animals?

Das Bild zeigt zwei fliegende Fledermäuse im Mondlicht. The picture shows two flying bats in the moonlight. Fledermäuse bei Nacht // Bats at night  (https://pixabay.com/de/)


At dusk, or depending on the species of bats little later, the batse begin their hunting flights. You then have the opportunity to watch the animals. Very useful and interesting is the use of a bat detector. Watch ever, touch never! Please do not disturb the animals in their quarters. Besides the fact that bats are wild animals and must not be taken out of the nature, even not for a short time, bats are very defensive. Their bites are very painful!If you find an injured bat or a bat in need of help, please contact the local wildlife rescue or the fire fighters or the police and ask for professional help. 

When an accident happens

Das Bild zeigt BUNDchen Fledermaus, der als Fundtier gerettet wird. // The picture shows BUNDchen Fledermaus, who is rescued as a found animal. BUNDchen Fledermaus wird gerettet // BUNDchen Fledermaus is saved  (Carina Bach / www.bund-fledermauszentrum-hannover.de)

If you find a bat in an emergency situation (lying on the ground, hanging on the wall during the day, falling into a container like a rain barrel or watering can), please click here.

How to protect bats from accidents at the house, look here. 

Homeless in the freezing cold! Bats don't find Winter-quarters

Das Foto zeigt eine Zwergfledermaus Pipistrellus pipistrellus // The photo shows a bat Pipistrellus pipistrellus Zwergfledermaus Pipistrellus pipistrellus  (Dr. Renate Keil / www.bund-fledermauszentrum-hannover.de)

With the start of cold in northern Germany many bats are looking for a frost-free place for the winter. But unfortunately due to tree fellings and house renovations there is hardly any space for bats. In Winter many bats can be seen flying around in a desperate attempt to save there lives. Sometimes they fly right into buildings or freeze to death. Please help the bats to survive. – Take action for the conservation and creation of winter quarters. – Please, spread the word! Thank you for your help. 

Found a bat - get help!

click here

Take Action for bats!

Die Zeichnung zeigt BUNDchen Fledermaus, er sagt zu dir Take Action! Werde aktiv für den Fledermausschutz! //  The drawing shows BUNDchen bat, he says to you Take Action! Get active for bat protection! click here

Ecosia - the search engine that plants trees

Das Foto zeigt einen großen grünen Baum // The photo shows a big green tree click here

Bats on Facebook

Die Zeichnung zeigt BUNDchen Fledermaus mit Handy // the drawing shows BUNDchen bat with cellphone click here

Bats on Instagram

click here

Bats on Youtube

Die Zeichnung zeigt BUNDchen Fledermaus auf der Bühne // the drawing shows BUNDchen bat on stage click here

Bats on Twitter

Die Zeichnung zeigt BUNDchen Fledermaus, der Zeitung liest // the drawing shows BUNDchen bat who is reading the newspaper click here
Das Foto zeigt eine Kleinabendseglerin mit dem Text Ich bin ein Wesen der Nacht. Hast du je an mich gedacht? Ich bin klein und unscheinbar, und bin doch so wunderbar. Kleinabendsegler Nyctalus leisleri  (Gudrun Becker / www-bund-fledermauszentrum-hannover.de)
Das Foto zeigt einen Großer Abendsegler Nyctalus noctula im Porträt // The photo shows a nyctalus noctula in profile Großer Abendsegler Nyctalus noctula  (Gudrun Becker / www-bund-fledermauszentrum-hannover.de)

„The future should not be foreseen but made possible.“ (Antoine de Saint-Exupery)