Figure 12.2 The discrete breeding events of the California quail. Each generation of new quail produced each spring is represented by a different color. Because births only happen in the spring, the growth of the California quail is better modeled by a geometric growth model than by an exponential growth model.

Data from J. T. Emlen, Jr., Sex and age ratios in survival of California quail, Journal of Wildlife Management 4 (1940): 92–99.