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Since the mid-1800s, marine mammals have been caught and imprisoned for entertainment. P. T. Barnum displayed dolphins and belugas, and, in the late 1800s, the Brighton Aquarium in England displayed harbor porpoises. By the 1870s, whales and dolphins were being captured and sold to parks in the United States and Europe. Major circus acts, such as Ringling Bros. and Barnum & Bailey Circus, have phased out the use of wild animals for audience entertainment. Many marine theme parks have promised to no longer feature trainers in the tanks with orcas but have not yet done so.