Sometimes it is necessary for the team to patrol on foot and sometimes they use speed boats on the rivers and canals which criss-cross the park.

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But the conservationists warn that, unless they act now, they will soon have to choose between killing off the manatee population completely or restricting boats so severely that messing about on the rivers, canals and bays of South Florida will no longer be such fun.

BBC: Manatee

Camera boats equipped with cellular phones and speakers stalk the anglers on the lakes and rivers.

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Forest nomads are losing their way of life, fish stocks have dwindled as topsoil has been washed into rivers, and wood is denied to those who want to build houses and boats, says Forests Monitor, an environmental group.

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