During the year following the granting of the Ph.D. Lashley remained at Hopkins as a Bruce Fellow in zoology. In the summer of 1914 he and Watson carried on field experiments on the behavior of sea birds. They made their observations on Bird Key in the Dry Tortugas, studying chiefly the homing, nesting, and reproductive behavior of sooty and noddy terns. That same year Lashley carried on experiments on the acquisition of motor skills in human subjects, color vision in birds, and conditioning of the salivary reflex.