title: Robots aren't the only physical models.
abstract: Webb compares robots to other behavior models in a novel space, but neglects significant portions of this space. The article's analysis of models would have been strengthened by including a broader coverage of physically embodied models and of models of social behavior. Nevertheless, Webb is correct to claim that robot construction will contribute to understanding behavior.
authors.affiliation: Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ 85721 pmidford@u.arizona.edu http://www.mesquiteproject.org/midford/
authors.forename: Peter E
authors.initials: PE
authors.lastname: Midford