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When a cat chases its prey, it keeps its head level. Dogs and humans bob their heads up and down.

Catfacts is a bot. I once got into a back and forth cat-facts battle with it that resulted in 30+ comments. It eventually repeated itself so...I won lol

LOL! I didn't realize it was a bot at first, and I was chuckling at the thought of a random person leaving cat facts on random posts. XD