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Stubborn, maybe, but if it ain't broke
(lemmy.nz)
A place for majestic STEMLORD peacocking, as well as memes about the realities of working in a lab.

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It's also a local maxima trap. To shift to chewing, they would have to change both bite behaviour, and teeth structure. The intermediate stage is a lot worse than either style.
Even if chewing was the better option, it's inaccessible from the crocs current method.