2) Wild orcas grow up with their pods and stay with them throughout their lives.
Orcas are highly social creatures, but only within specific, tight-knit social networks: their pods. Regardless of a pod's size, it's an insular group; whales in different pods communicate using different "languages," are often genetically distinct, and do not mix well with one another. When pods are separated -- as they are at SeaWorld -- it's emotionally devastating for the orcas. And when pods are mixed -- as they are at SeaWorld -- it's even worse. Captive orcas will attempt to maintain their hierarchical social structures through violence and aggression -- specifically by "raking" other whales, or scraping their bodies savagely with teeth.
3) Wild orcas swim as much and as far as they need -- without having to drive themselves crazy swimming in circles.
Granny recently finished an 800-mile journey with her pod -- a pretty normal trip for an animal that swims up to 100 miles daily. In captivity, though, orcas are deprived of the ability to swim far and wide, which most often prompts them to swim circles continuously in their tanks. According to the Whale and Dolphin Conservation Society, swimming in circles is associated with dorsal fin collapse, from which virtually all captive male orcas suffer. (Only 1-5 percent of wild orcas exhibit collapsed dorsal fins.)