The river is one of the best places to observe Amazonian wildlife, including the Amazon river dolphin and tucuxi.
In 1984, Martin, who has long been involved in environmental causes, appeared in a public service announcement to help save pink dolphins in the Amazon River.
The Amazon river dolphin (Inia geoffrensis) that live in the river systems of Brazil, Bolivia, Peru, Ecuador, Colombia and Venezuela.
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In 1847, he and Paul Gervais compared it to "Delphinius geoffrensis" (=Amazon river dolphin, Inia geoffrensis), which had been described from a stuffed specimen in Lisbon, and the two were considered synonyms for more than a century.
The Boto, or Amazon River Dolphin, is also known to inhabit the Orinoco River system.