why do fish and birds have less calories than cows and pigs?
In: Biology
It depends from the source.
Wild animals are on average more lean than farmed ones.
A poultry factory chicken could have more calories per gram than a wild deer, so to say.
First example that comes to mind are ancestral foi gras geese. The method was to nail the goose feet to the ground and feed it 24/7 through a funnel directly shoved into its stomach.
No movement, only feeding.
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