Tourists 'break the rules' diving with humpback whales in Tonga
Fears of over-tourism and the conduct of foreign operators are putting Tonga's whale-swimming industry in the spotlight.
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Fears of over-tourism and the conduct of foreign operators are putting Tonga's whale-swimming industry in the spotlight.
Their leading hypothesis is that the young cetaceans are dying from a bacterial infection, but experts are still trying to figure out why this year's mortality rates are so high. Adults have also been washing up dead, possibly because of a toxic algal bloom
Northern bottlenose whales are more likely to stick together when individuals are poorly or emaciated
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