MAMIRAUÁ RESERVE, Brazil—A hoarse sound abruptly wakes visitors staying at a floating house that serves as a base for environmentalists on the Jaraua river in the Amazon rainforest.
During flood season, the Mamiraua Sustainable Development Reserve—located 500 kilometers (310 miles) from the Amazonas state capital Manaus—fills with water.
For researchers from the Mamiraua Institute and WWF-Brazil, that means their nearest neighbor is a caiman they call Dominique. It has decided to squat for the day at the
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