Purple martins are active at their seasonal roost at the Nebraska Medical Center campus at midtown Omaha. There were several hundred present on the the evening of June 24th. The martins present are the vanguard for the multitude that will occur in the coming weeks. Any day now is a good time for a visit to enjoy the spectacle of the birds as they gather in the aerosphere, and then swoop into the trees which are their roost for the night. There are also a bunch of common grackles and European starlings gathered at the place.