He was diligent and he did come up with some pretty complicated plans to capture roadrunner. Unfortunately for him, they usually backfired. He did catch him once, but to his dismay, roadrunner was to big. He only was able to hold on to his leg since roadrunner was so much bigger than him. He was a very smart coyote even though things didn't quite work out for him.
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"Underneath this mask is... another mask!"