Abstract

Peromyscus truel's a fairly common inhabitant of the upper sonaranlife zone of the Western States. It is an excellent laboratory anlmal with the limitation that captivity must be accompanied by forced activlty, in order to keep the animals within the limits of normal activity. This mouse is polyestrous and breeds from early spring to late fall. Observations have shown pregnancy in late September and in early February. It is the writer's belief that ovulation in the ovary occurs only when copulation has taken lace, because corpora lutea has only been found in pregnant or lactating females. The evidence is scanty however and more work will have to be done in order to prove this belief. Home range, migration, populations and food habits and not thoroughly worked out because of the difficulty of trapping in a defined quadrat among the cliffs.

Degree

College and Department

Life Sciences; Plant and Wildlife Sciences

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