Skeletochronology

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Skeletochronology is used to determine the chronological age of a species of animal by counting the concentric growth rings found in a cross section of bone. Can not be used for all species of animals.

Frogs are an example of a type of species that this works with. Cutting the femur of the frog off and then cutting the bone with a freezing microtome and then looking at it under a microscope will allow you to see the growth rings.

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