Purple Martin Forum

Can the English House Sparrow get thru a 1" hole ? this is for tree swallows

OVAL TREE SWALLOW ENTRANCE: HOW TO MAKE This web site shows how to make a 7/8" hole for for Violet Green Swallows, but it recommends a 15/16" hole for tree swallows https://www.youtube.com/watch?v=joOET1fQjxM ================= This article is mainly about Violet Green swallows, but they re...

For those of you who are making the slot entrance to keep house sparrows out of your tree swallow houses, it has been suggested by one member to use a caliper to make sure the hole is the correct size. That may be why the slot entrance doesn't work for you.
allen

For those of you who are making the slot entrance to keep house sparrows out of your tree swallow houses, it has been suggested by one member to use a caliper to make sure the hole is the correct size. That may be why the slot entrance doesn't work for you.
allen