In the last week, a hundred pink river dolphins have been found dead in Lake Tefé, in the Amazon, amid a historic drought and record temperatures in Brazil.
At least 70 bodies of the marine mammals surfaced last Thursday, when the river's temperature reached 39 degrees, a figure more than 10 degrees above the average normally recorded at this time of year.
Although scientists are still studying the relationship between the heat wave in the country and the death of dolphins, they have set off alarms, as the species is extremely vulnerable to climate threats, due to its slow breeding cycle.
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