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Individual recognition has been used to assess the size of elephant, lion and tiger populations. For larger populations mark-release techniques estimate the proportion of the population marked.

Another estimator for very small populations was developed to assess whether tsetse flies had been eradicated by sterile male releases. In that instance virgin female flies were released and then resampled to see if they had been inseminated by any surviving wild male flies. But, because males can inseminate more than one female, a few females are inseminated more than once, and not all females were recaptured, this was more an estimator of population presence than population size.