Macaw (Family Psittacidae)
The jaw of a macaw shows a wonderful example of a 3rd Order lever; the upper and lower jaws form the fulcrum; the jaw muscle (masseter) is contracting, pulling the jaw upward; the lower jaw is moving upward.
The jaw of a macaw shows a wonderful example of a 3rd Order lever; the upper and lower jaws form the fulcrum; the jaw muscle (masseter) is contracting, pulling the jaw upward; the lower jaw is moving upward.
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The jaw lever has a VR around 5/1.