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Mark & Recapture
We did this with mealworms, but it can also be done in other ways:
grasshoppers
students
A teacher in Northampton, MA suggested having students hand out candy on their way into class. Then your science class "resamples" by visiting one or two classes and determining how many students are in each & how many got candy. The registrar can give you the real estimate of the number of kids in school that day.

 

red spotted newt
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