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Locomotion and activity phasing of some medium-sized mammals.

Six carnivores and a monkey studied in the laboratory spent most of their active time treading a wheel. Some of the animals had essentially the same phasing of activity known or presumed in the wild, namely the pig-tail macaque (diurnal), ringtail (nocturnal), and bobcat (arrhythmic). The tayra and grison were diurnal, raising the possibility that the nocturnal activity reported in the field is a consequence of man's encroachments. The bimodal activity of the grison (and to a lesser extent the tayra), including a mid-day siesta, concurs with behavior under semicaptive field conditions. Both the bobcat and domestic cat were arrhythmic, with pronounced peaking of activity during artificial twilights. The red fox was primarily nocturnal with activity peaking during periods of twilight but, as in the field, daytime activity also occurred. The macaque, grison, and tayra were relatively insensitive to temporary abrupt changes in light intensity during their activity periods. The ringtail was more like nocturnal rodents, being fairly rigidly bound by conditions of illumination. The red fox and bobcat were inhibited by dim light and darkness. The bobcat was entrained to a 4-hour “day” by alternating dawns and dusks every 2 hours. Gaits ranged from the slow “deliberate” walk of the cats to occasional galloping by the red fox, ringtail, and cats. In addition to walking, the macaque and tayra engaged in acrobatics. All seven animals showed strong tendencies to tread in one direction, despite starting and stopping hundreds of times.