Brazil: the challenge to save the last 30 dolphins, symbolic of the seas of Rio de Janeiro

According to scientists, Brazilian cetaceans have the highest rate of pollution ever recorded in any animal in the world; tracking this species has become a challenge for which specialists use equipment such as hydrophones.

RIO DE JANEIRO, BRAZIL - In a corner of the sea where the tropical paradise of Guanabara Bay is located in the state of Rio de Janeiro, a female Guiana dolphin swims next to a newborn calf.

The only sound is the hiss of the whales' breath as they rise to the surface. The water looks like a mirror, and time has stopped.

The only movement is the dolphins performing acrobatic feats in the landscape framed by the Serra dos Órgãos (Organ Mountain) - the same landscape that has enchanted generations for centuries. Silence and animals are the last survivors of . . .

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