Making a one way flap so they can get out but not back in in the solution.
Microbats in roof.
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Others can be found in caves or substitutes such as old mines.
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If these tiny bats cannot find a suitable hollow they can fit into very small gaps and utilise your roof and walls.
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The smallest microbat weighs only 3 grams.
Microbats can eat as much as 40 of their own body weight in a single night or several hundred insects per hour.
Some microbats roost in tree hollows or cracks and fissures in dead tree trunks or under loose flaking bark.
Microbats love your roof space micro bats are notorious for nesting in roof spaces and wall voids and can cause considerable stress for the home owner who can t sleep because of the constant squeaking and scratching taking place.
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Tree roosting species are often also found in human made structures such as buildings inside the roof or walls regardless of whether humans live there or not.