Coyotes will most certainly eat watermelon, and many other fruits, nuts, seed pods, grasshopers, snakes, etc. Out here in eastern CO. you'll find that they often times eat the cactus seed pods right off the top of cactus. This time of year, there aren't many insects yet to eat, this years pups have a hard time catchingwarm bloodedprey of any kind, so they eat what they can to survive.

Those coyotes eating the watermelon most certainly can be called in with distress calls. Think about it, a warm fresh meal of meat, or a cold watermelon again and again and again....etc.