Some swallows will be disappointed when they return from South Africa in the spring, as their temporary home will be closed up for housing humans.
From research there is no point in bird boxes on trees as 1. they won't use them because: 2 squirrels will get in.
I can't find any info on alternative locations, but was thinking perhaps a substantial box fixed to the outside of an outbuilding, with a swallow slot and some shelves inside.
Comments and suggestions please?