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... But if they are higher up the food chain they also accumulate far, far higher levels of heavy metals. This is true for meats and fish.

True, and I vaguely recall a case or few where people showed off their rich tastes (for swordfish steaks, etc.) until their nerves & muscles didn't particularly work together.

But, back during the formative millennia of human nature, that wasn't a problem.

Plenty of counterexamples. I think scallops are probably the best tasting seafood if not one of the best tasting foods period and they're filter feeders. Shrimp is pretty good as well. Meanwhile, bear tastes pretty bad.

I quite like bear - tastes like a beefier beef. Depends on what the bear ate.

Statistically true. But are herring, pigeons, and rabbits meaningfully less nutrition-dense than large/dangerous/brag-worthy game?