Figure 14.7 Cyclic fluctuations in the populations of snowshoe hares and lynx. records from the Hudson’s Bay Company of pelts purchased from trappers demonstrate that the populations of hares and lynx went through cycles approximately every 10 years.

Data from D. A. MacLulich, Fluctuations in the number of the varying hare (Lepus americanus), University of Toronto Studies, Biological Series No. 43 (1937).