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Such tests have also been used for quantitative tests of theories of animal timing, such as Gibbon's Scalar Expectancy Theory ("SET"), [77] Killeen's Behavioral Theory of Timing, [78] and Machado's Learning to Time model. [79] No one theory has yet gained unanimous agreement. [1] Tool and weapon use [ edit ] Template:Main Although tool use was long assumed to be a uniquely human trait, there is now much evidence that many animals use tools, including mammals, birds, fish, cephalopods and...