Walking out an office building on North Wacker earlier this week, I noticed a little dark gray mouse on the sidewalk. No -- a bird. No -- a mouse. No -- a bat. I wondered if it was dead. While I was wondering, a seagull swooped down and snatched it. This made me think about Chicago Bird Collision Monitors, who may or may not be interested in bats, but just opened a bird hospital and are looking for volunteers to help scour the Loop for stunned and injured migrating birds this season. A training session is scheduled for next Tuesday evening (May 9) at 7pm at the Peggy Notebaert Nature Museum.