>> Tweeters
>> I live in the San Juan Islands off the coast of WA.
>> I have boxes up for Greenback Swallows. I was wondering when they start to
>> nest and should they be cleaned out each year? I have heard both answers.
>> I had nests in four of the boxes the first year. 2006...but none last year...2012.
>> I have tried cleaning and not cleaning the boxes with 3 to 4 nests each year except last year.
>> Theresa
>> San Juan Island
>