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One method is the capture-recapture method.

Some rabbits are captured, tagged and then released back to the wild. After allowing some time for them to mix back into the population, the capture process is repeated.


Suppose the total number of rabbits originally tagged was X. Suppose at the recapture stage, there are T tagged rabbits out of a total of C captures. Then T:C represents the ratio of tagged rabbits to all rabbits in the recaptures. If the rabbits have been given enough time to be evenly mixed in the overall population, then the total population is X*(T/C).


This method depends crucially on the assumptions that there is no bias in either stage of capture/recapture. If these are carried out near a rabbit colony then the result might reflect only the colony population, not the whole population. The second assumption is that there has been enough time to allow the population to be mixed again. This might not be the case if the animals are very territorial so that the recapture would act on the same sub-population again. There is also the assumption that the tagging process does not affect the animal in any way. It can traumatise the animal in such a way that its behaviour is modified. It is also possible that any contact with human beings leaves a trace which other animals can react to.


[The last is based on local advice: I live close to a park which is inhabited by deer. They are so used to human beings that it is possible to go up to fawns and touch them - and children love doing that. But that leaves a human scent on the fawn which then spooks the mother. The fawn can be rejected and suffer the consequences - which could be death!]

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