Mark–release–recapture (Lincoln index)

Enter the number marked, the number caught the second time and how many were marked to estimate the population.

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Questions students ask

What assumptions does it make?

No births, deaths or migration between samples, marks do not fall off or harm the animal, and marked animals mix back fully.

What formula does it use?

Population ≈ (first sample × second sample) ÷ number marked in the second sample.

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