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Mystery deaths of 80 dolphins off Brazil coast

Environmentalists in Brazil say they are trying to figure out why more than 80 gray dolphins have died in less than a month on the coast of Rio de Janeiro state.
A statement from the Gray Dolphin Institute says the dolphins died over past 17 days in the Bay of Sepetiba, a coastal district about 70 kilometres west of the city of Rio de Janeiro.
More than 80 dolphins have died in less than a month. (Image: AAP)
More than 80 dolphins have died in less than a month. (Image: AAP)
The institute is an NGO that monitors and strives to protect the dolphins.
The institute says it has retrieved five dead dolphins a day from the bay but what has caused their deaths is still unknown.
Lab tests are being conducted and the results are expected by the end of the month.
- With AP.
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