A method is presented for estimating population size from index data collected before and after removal of a known number of individuals. An approximate variance estimate is given and used to delineate circumstances where the method may be useful. Confidence limits are obtained from Fieller's method and illustrated with data from feral horse (Equus caballus) herds. A comparison with the use of marking is provided.
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L. L. Eberhardt (1982) studied this question.
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