Long-Lived Turtles

Grade Levels: 5 - 7

In this activity, students learn to estimate turtle size and age. It is important to go over procedures for safe handling and care of live reptiles and amphibians with your students. Also, be sure to have students wash their rulers and hands with antibacterial soap or wipe them with hygienic wipes. Point out the importance of doing this: to avoid infection from the turtles and to avoid the possibility of spreading infection from one turtle to another.


Students will learn how to estimate the age of turtles and how to measure a turtle's size.


  • Live turtle(s) or turtle shells
  • Flexible transparent rulers with millimeter scale
  • Copies of two diagrams: Measuring Turtle Length and Estimating Turtle Age from Scutes
  • Hygienic wipes or antibacterial soap


  1. View background information on Reptile and Amphibian Life Span and Life History.

  2. Demonstrate safe handling of a live turtle.

  3. Identify the parts of the shell including carapace (back), plastron (underside), and scutes (scales).

  4. Refer to the diagram to show students how to measure the length of the turtle's plastron along the midline from one end to the other. Then demonstrate how to measure the carapace length using first the straight-line method and then the curved-line method.

  5. Have students measure the length of each turtle shell and record their measurements.

  6. Point out the lines on the scutes of either the carapace or plastron. Use the diagram to demonstrate how to count the lines on one scute. The number of lines on each scute represents an estimate of the age of the turtle.

  7. Have the students count the lines on one scute and record their observation.

  8. Ask students to estimate the approximate age of the turtle based on the number of lines on a scute. If you have several turtles or turtle shells, students can relate the age to the size of turtles. They may want to draw a graph showing age on the x-axis and size on the y-axis. Have the students discuss how big the turtle would be at sexual maturity if it occurred at age 5, age 10, or age 15.

  9. Discuss factors that may influence the growth of turtles and the formation of growth lines.
Excerpted from Hands-On Herpetology.

If you need to teach it, we have it covered.

Start your free trial to gain instant access to thousands of expertly curated worksheets, activities, and lessons created by educational publishers and teachers.

Start Your Free Trial

Follow us on:

Follow TeacherVision on Facebook
Follow TeacherVision on Google Plus


December Calendar of Events
December is full of events that you can incorporate into your standard curriculum! Our Educators' Calendar outlines activities for each event. Happy holidays!

Bullying Prevention Resources
Bullying can cause both physical and emotional harm. Put a stop to classroom bullying, with our bullying prevention resources. Learn how to recognize several forms of bullying and teasing, and discover effective techniques for dealing with and preventing bullying in school.

Conflict Resolution
Teach your students to how resolve conflict amongst themselves without resorting to name-calling, fights, and tattling.

Immigration Resources
Studying immigration brings to light the many interesting and diverse cultures in the world.