Question: how strong are tree frogs feet?

Niall Crawford answered on 10 Mar 2013:

Depends on what you mean. I study the sticking ability, which isn’t to do with how strong the actual feet are, but how much stickiness the toe pads have. Their legs (especially the back ones) will have very strong muscles for jumping. In terms of stickiness, each toe pad can produce roughly 4 mN (millinewtons) of force, and they have 4 on each front foot and 5 on the back feet, which makes 18 x 4 = 72 mN of sticking force. It all depends on the size of the frog, some will have bigger toe pads, some will have smaller bodies so don’t need such sticky pads. Hope that has answered your question!