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Representative force–length curves for three frog species. (A) Cane toad, (B) bullfrog and (C) Cuban tree frog. One representative contraction that produced the highest work is shown for each species. The muscles start on the descending limb of the force–length curve and shorten onto the plateau against the stretch of the tendon. The shaded triangles represent the work (or energy) that was stored into the elastic elements.
