Thesis (Ph. D.)--University of Wisconsin--Madison, 1965. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1943. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 63-64).

Thesis (Ph. D.)--University of Chicago, 1912. / Includes bibliographical references (p. [27]-29). Also available on the Internet. Also issued online.

Thesis (Ph. D.)--University of Chicago. / Reprinted from the Journal of morphology, vol. XX, no. 1, April, 1909. "Literature": p. 53-54. Also available on the Internet. Also issued online.

Thesis (Ph. D.)--University of Chicago, 1916. / "A Private Edition Distributed by the University of Chicago Libraries." "Reprinted from the American journal of physiology, vol. XLI, no. 5, November, 1916." Includes bibliographical references (p. 569-570) Also available on the Internet.

In the first experiment two hungry, but otherwise undeprived, pigeons were exposed to various fixed interval food reinforcement schedules for keypecking while either water or grit was concurrently, freely available. The inter-reinforcement interval was varied from 30 sec to 16 min in different phases of the experiment. Both subjects consumed grit, but neither subject drank water. The next four experiments attempted to replicate the grit consumption that occurred in the first experiment or to produce water consumption. In these experiments the grit and water containers were moved to various locations within the experimental chamber, the protein content of the subject's diet was varied, and the reflective windows in the chamber were covered to eliminate the possibility that attacks at their own reflections were competing with the subject's tendency to consume grit or water. The subjects did not consume grit or water in any of these experiments. The implications of this lack of consistent water and grit consumption behaviour in the pigeon for various theories of the determinants of behaviour are examined. / Arts, Faculty of / Psychology, Department of / Graduate

No description available.

When different foraging specialists in a homospecific group have the option of joining each other's food discoveries, a skill pool may be established. Two field experiments on urban populations of feral pigeons (Columba livia) show that this species has the first prerequisite of the skill pool effect, the presence of individual foraging specialisations. Urban pigeons show marked individual variation in daily feeding site use patterns and food preferences. Two aviary experiments on a captive flock of C. livia show that pigeons also have the second prerequisite of skill pools, exchangeable producer-scrounger roles. Different individuals adopt producer or scrounger roles depending on patch type and flock composition when given four different food discovery tasks. Scrounging increases an individual's tendency to associate with producers, while simultaneously inhibiting observational learning of the food finding technique.

Thesis (M.S.)--University of North Carolina at Wilmington, 2006. / Includes bibliographical references.

No description available.