# Capture/recapture

Capture/recapture, or mark and recapture, is a method for estimating population size when a full count of the population is unavailable or unfeasible. It is commonly used in biological and ecological studies to estimate the populations of wild organisms. To employ this method, capture and mark a sample of the population being estimated, and then release the marked individuals back into the population. Then recapture a new sample and note the number of marked individuals. The total population size (N) can be estimated by the equation , where M equals the number of individuals marked in the first sample, C equals the number of individuals captured in the second sample, and R equals the number of marked individuals captured in the second sample.

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