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Updated: May 4, 2025
In the Lower Amazon are two species; one of which, the tucuxi, when it comes to the surface to breathe, rises horizontally, showing first the back of its fin, and then, drawing an inspiration, generally diving down head-foremost; and another, called the bonto by the natives.
It seems thus to pitch heels over head, but does not show the tail fin. Besides this peculiar motion, it is distinguished from the Tucuxi by its habit of generally going in pairs. Both species are exceedingly numerous throughout the Amazons and its larger tributaries, but they are nowhere more plentiful than in the shoaly water at the mouth of the Tocantins, especially in the dry season.
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