Bears rookie quarterback and fifth-round draft pick Nate Enderle arrived in Chicago on Sunday and has begun working out with the team, according to sources. Enderle, who impressed Bears offensive coordinator Mike Martz in a private pre-draft workout, passed for 8,181 yards and 62 touchdowns as a four-year starter for the University of Idaho. He is expected to open training camp as the Bears' No. 3 quarterback behind incumbent starter Jay Cutler and Caleb Hanie.