Brooklyn College
City University of New York
Lab #6, ASSIGNMENT #3Page 3

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POSTURE INDEX OF A SPRAWLING TETRAPOD: The iguana pictured below is clearly a sprawler. Using the scale bar in the picture, measure its leg spacing and foot length. Rather than smear your monitor screen, you might want to print out a hard copy of this page, and use that to make your measurements. Record your results.

Keep in mind that iguanas are tree-climbers, and their long middle toes have evolved to allow them to grasp tree branches. The long toes are not involved in iguana walking. It is the short inside toes that they use when walking. So in measuring foot length, you will want to measure the distance from the heel to the tip of an inside toe.

Now we need to measure posture index for an erect tetrapod.
We do that on page 4.