"I wrote this book for dolphins because we are mistreating these animals by keeping them in captivity," Brenner said.

我写这本书是为了拯救海豚。因为我们人类正通过拘囿的方式来虐待这些生灵。

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The San Francisco group is leading efforts against keeping dolphins, orcas and other advanced sea life in captivity.

这个旧金山的组织正在带领大家努力去反对圈养海豚、逆戟鲸和其它高级海洋生命。

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Talking of campaigns by our charity to phase out the keeping of animals in captivity, Dartmoor zoo owner Ben Mee says: "Actually, I can see their point;"

谈到我们以逐步淘汰人工饲养动物为目的慈善活动，达特穆尔动物园的老板本梅伊说：“事实上，我了解他们的观点；

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And if a zoo is treating the bear well - as he believes Berlin Zoo was with Knut - then keeping some in captivity is a price worth paying.

BBC: Knut: A polar bear story

Many animal welfare organisations argue that the capturing and keeping of dolphins in captivity is cruel.

BBC: Dolphins helped my child

Blackfish, about the consequences of keeping killer whales in captivity, is among the documentaries that will be screened at the O2's Cineworld cinema multiplex between 25 and 28 April.

BBC: Sundance London film festival announces 2013 line-up