When I was a child, our family was camping on the beach near San Felipe in Baja, and my Dad and I woke to find a coyote sniffing my sister's face (she was maybe eight at the time). My Dad chased it off, but he was visibly shaken by the episode. Other than that, I've never had a close encounter with one. I had never heard or read of a coyote attack on humans before.
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