A strange forest

In a strange forest, there are 6 werewolves, 17 unicorns and 55 giant spiders.

  • A werewolf can eat a spider or a unicorn, but it can't eat another werewolf.

  • A spider can eat a unicorn, but it can't eat a werewolf or another spider.

  • A unicorn can eat nothing, be it a spider, a werewolf, or another unicorn.

  • When a werewolf eats a spider, it turns into a unicorn, and when it eats a unicorn, it turns into a spider.

  • When a spider eats a unicorn, it turns into a werewolf.

What is the maximum number of living creatures left in the forest, given that no other creature can be eaten?

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Bonus: How many of each species are left alive in the end?

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