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The problem isn't that a woodpecker becomes a toucan. It's called EVOLUTION. It implies a drastic change in species.
The problem is that Pikipek and the Toucan evolution share NOTHING outside of colors.
When you see Pikipek, do you see 'just' a woodpecker? No, it's unique crest, reminiscent of a cute bobcut, and shape language is what makes it Pikipek, not just a cartoon woodpecker.
It's stylized to feel like a Pokemon, unlike the Toucan, who might as well be on a cereal box.