Rescuers using boats and drones worked for three days last week in a lush stretch of Bolivia’s Amazon rainforest to find a pair of trapped pink river dolphins, a species endangered by steady encroachment along the waterways the colorful mammals call home.
The two dolphins were found languishing in still water ponds cut off from the Bolivian Amazon’s Rio Grande after they swam inland and the main channel dropped, said Claudia Venega, a biologist with a rescue program.
She said that many pink dolphins lose access to the river because of their reproductive instincts.
“When the females go to give birth they seek out quieter places and so they leave the river in search of calmer backwaters,” she said, adding that other females often join to help raise the infant calves and teach them to fish.
Over the past dozen years nearly 60 trapped pink river dolphins, scientifically known as Inia geoffrensis boliviensis, have been rescued, she added.
The dolphins’ rosy complexion is due to blood vessels close to their skin, although some specimens are blue or even white.
While scientists have documented just a handful of fresh-water dolphin species, the pink river dolphins are the largest, growing up to 2.7m long and weighing 136kg.
Believed to be semi-divine creatures by some indigenous groups, they use echolocation to navigate often murky waterways.
Their populations have fallen sharply along with deforestation, researchers said.
Sharol Deem, another member of the rescue program, said that efforts to conserve the species point to even larger ecological goals.
“That’s really one of the beauties of this project right now,” she said, adding that efforts to study and protect “this magical creature” can boost environmental sustainability for all species, including humans.
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