“Why is my bat box empty?”

Bats are wild an­i­mals and, like all wildlife, can­not be to­tally con­trolled by hu­mans or be forced to move into a bat house. There are many rea­sons why they may choose not to live in a bat box:

go! Platteland - - BATS -

1 The bats in your area may be very happy in a nearby safe roost and de­cide not to leave their home un­less they are ex­cluded from the roof of a build­ing, for ex­am­ple. 2 The bat house is be­ing dis­turbed too much (shin­ing a flash­light into the house ev­ery day or dur­ing the night to see if bats have moved in is not a great idea, for in­stance). The tell­tale sign of oc­cu­pancy is a col­lec­tion of guano on the ground be­low the box. 3 The bat house is not get­ting enough sun­light to warm up the box. Ob­serve the po­si­tion of the sun care­fully, tak­ing all four sea­sons into ac­count, be­fore in­stalling the bat house. Ideally it should be in a po­si­tion where it can ab­sorb the north­west­erly sun in the late af­ter­noon. 4 The use of in­sec­ti­cides in the gar­den or on crops that are poi­sonous to mam­mals when taken orally may mean the bats have ei­ther died from eat­ing in­sects con­tam­i­nated by the chem­i­cals, or they may have moved to safer grounds. 5 The food source for the bats has de­creased. This may hap­pen when in­sect pop­u­la­tions de­cline dur­ing win­ter, which is nat­u­ral, or when large stretches of grass­land or bush have been cleared around the bat house. In both cases the bats will prob­a­bly re­turn when their food source re­turns. 6 Bats like warm, dry roosts and will go in search of such spots if their bat box is too cold and wet. This may hap­pen if rain­wa­ter leaks in or the bat house is po­si­tioned in­cor­rectly.

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