I might be wrong, but I think a total of 10 draptors spawns each raid, they can be found all over muggy plains. According to Tibia.fandom.com these are the places where you can find them:
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However, from my experience (I tamed a draptor and completed the bestiary) this are the places with more chance where you could find them:
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On the spot to the south you can usually find more than 1 draptor spawning at the same time, but its also the most crowded one.