title: Free Willy--and all his pals. Orcas and elephants are smart, social and way too large for captivity.
mesh_terms: D000827:Animal Welfare; D000818:Animals; D000836:Animals, Zoo; D004606:Elephants / Q000523:psychology*; D007360:Intelligence; D012919:Social Behavior; D014907:Whales / Q000523:psychology*