The purple martins are coming!!!
In the next few weeks males will be arriving to check out the accomodations. If this is the first year putting up a house, you are more likely to get first-year males (who haven't nested yet) because second-years and so on will return to previous year sites.
Check out books at the library or go to:
(THE purple martin website)
It is a big responsibility to house martins. You need to be willing to do egg counts, throw out interlopers, etc.
The storm water marsh I will be building this year is primarily for the martins...that, and I want to save our foundation at one corner of the house.