A map turtle's age written right on its back, and those who know how to measure it can get an approximate age. A map turtle has spikes on the middle of its shell, which are known as keels, that shrink with age. This species of turtle can live up to 30 years in captivity, so if keels are almost flat, the turtle is anywhere from 20 to 30 years old. If keels are tall, the turtle is young--anywhere from 1 to 10 years old. An owner can track the turtle's age by measuring the keels every year.
Things You'll Need
Ruler
Marker
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Instructions
1
Gently pick up the turtle and place it on a smooth surface.
2
Map turtles have distinct map-like markings on their heads.
Locate the keels in the middle of the shell, directly behind the head. There should be anywhere from three to five different keels.
3
Use the ruler to measure the height of the tallest keel; only one keel measurement is needed. Measure the tallest so it is easier to tell how much it shrinks from year to year.
4
Keep track of keel heights.
Write down the height of the keel and keep track of the turtle's approximate age.