In Brazil, the dolphins that team up with local fishermen have...

In Brazil, the dolphins that team up with local fishermen have their own accent. For over 160 years, wild dolphins have been helping humans catch more fish by signaling when they should cast their nets. 

Because they use their own unique whistles even around other dolphins, scientists think they may be trying to distinguish themselves as ‘the ones who help humans.’

(Source, Source 2, Source 3)

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