Measurements of the rates at which droppings of wall lizards (Podarcis muralis) on Jersey appeared in, and disappeared from, the environment made it possible to formulate a simple mathematical model for the dynamics of faecal pellet populations. The model shows how, for a given lizard population, the number of droppings changes with time according to weather conditions. It was used to estimate lizard densities at a number of sites from daily pellet counts. There were significant differences in the densities of lizards between sites; possible reasons for these are discussed.
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