I have a lot of swallows around my ponds. If I tried to attract purple martins would they compete to the detriment of either species?
I have a 4 inch inflow pipes to each pond and if I'm not careful a pair of swallows will nest in the open end od one of them. One year I noticed a pair of swallows started making a nest in it. Since I was going to fill that pond later after draining, I didn't want them to make a nest and have young in it to only have them washed out. So I capped it and attached another pipe above it for them to next in. When I first capped it the pair were pissed as heck and if I could understand their chatter I'm sure it would have been profanity.
