The death of a Sea World orca trainer revives the question of whether or not it is ethical to keep killer whales in captivity.
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Dolphins are so smart, it’s morally criminal to keep them locked up in tanks. In fact, we should be treating them as “non-human persons”, say scientists who have been studying the animals’ intelligence and behavior.
The researchers say that these sea mammals are brighter than chimpanzees, with many key brain features that are associated with high [...]
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