The purple martins will return in the next week or so. I re-opened the apartments in my purple martin house just this last weekend. If you have a purple martin house you should remove the winter door stops by the first of April. It is thought that the birds not only return to the same house every year but also return to the same apartment in that same house every year. Purple martins are the largest member of the swallow family. Purple martins are a great natural, 'Green' way to control your mosquito problem. Purple martins can consume their weight in mosquitoes every day. The can digest them almost immediately. Some scientists estimate that a single purple martin can eat 2000 to 3000 mosquitoes each day. They like being around humans and provide endless entertainment from watching their flight patterns. In spring and summer they can be found in most of the United States and in southern Canada.
These birds winter primarily in Brazil and return to the same house and same compartment each year ! Native Americans would hang out empty gourds to attract these birds. When Europeans arrived in America bird houses were built to attract them. Purple martins are very clean birds that actually carry waste sacs from their nests before disposing of them. Wood bird houses can carry parasites so in the last forty five years purple martin houses have been constructed of aluminum.
If you want to get rid of mosquitoes go "Green" and put up a purple martin house. Below is some info if you are interested. It can be a family project.