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Swallows again

I asked about access for swallows in outbuildings a while ago and have now arranged for someone to make a hole in the garage wall which I'm hoping they will use - previously kept doors open but had a rat move in.
I have read that the hole needs to be a minium size but does anyone know if it has to be a certain shape - round or rectangular etc?


  • bertrand-mabelbertrand-mabel Posts: 2,198
    When you see swallows flying in and out of buildings they do seem to go through a rectangle opening. Not sure if that is what they prefer or that is what is available.
  • wild edgeswild edges Posts: 9,371
    We're normally told by ecologists that we can leave a brick out of a wall for swallow access. A missing brick leaves a hole 235mm wide and 75mm high. Make sure the hole is well away from anywhere that a cat could sit. On some projects we've fitted a metal tray that covers the sides and base of the hole with the base part being steeply sloped outwards. This helps to stop non-flying animals jumping up and using the hole.
    Tradition is just peer pressure from dead people
  • alfharris8alfharris8 Posts: 513
    Thanks for reply. We have decided to go for a brick sized rectangle. 
    Great idea about the tray. I do hope they use it. We love them coming every summer. 
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