Why is your frog stiff and not limp like many dead animals you may have encountered?

The stiffness in a frog, known as rigor mortis, occurs after death due to chemical changes in the muscles as ATP (adenosine triphosphate) levels drop. Without ATP, muscles cannot relax, leading to a rigid state. This phenomenon typically sets in a few hours after death, causing the frog to remain stiff rather than limp, which can be more common in animals that decompose quickly or have a different muscle composition.