|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.