Only found this out to day I have got a sparrow nest box on side of house was in use by sparrows last year and was wondering why not this year, and was tonight talking to guy who lives next to me who infrormed me that hes seen bats comeing out of this box and not just once but many times said he thought I new and it was what the box was for, I have seen bats many times over my pond normaly around twilight, will these bats move to a bat box if I put one up for them I will wait till winter to do this, then again are they likely to come back next year. Only found this out to day I have got a sparrow nest box on side of house was in use by sparrows last year and was wondering why not this year, and was tonight talking to guy who lives next to me who infrormed me that hes seen bats comeing out of this box and not just once but many times said he thought I new and it was what the box was for, I have seen bats many times over my pond normaly around twilight, will these bats move to a bat box if I put one up for them I will wait till winter to do this, then again are they likely to come back next year. Bats are social animals and may well move to a bat box