i agree w/ MosKAU,
Overall, bovine/poultry/swine/etc. are usually breed for human consumption...
Those animals can be raised in a control enviorment just for the use of food, while dolphins cannot be.
Of course, you can argue about that people fish and also catch crabs/lobsters, however, those animals are regulated by fish and gaming associations regarding to regions and minimum size/weight that the fish can be fished for food.
dolphins on the other hand are not regulated for fishing, but more for preservation. same goes with other ... (
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