Posted on May 6, 2022May 6, 2022 by L. L. CoblePhoto of the Day In spring, the majority of migrating Rusty Blackbirds move north through the lower Susquehanna basin in late March and April. Some, like this female seen yesterday along a forested tributary of Conewago Creek east of Conewago Falls, linger into May. Because it is almost exclusively a denizen of wet bottomlands, the Rusty Blackbird is the least numerous of the regularly occurring blackbirds in our region.