Define "Basins". Then ask yourself how many Rivers, Lakes, Islands, Deltas, Wetlands, Drylands, Highlands, and other niches occur in the Amazon "Basin". Again, assuming you want a cut and dry answer, your question was pretty vague. Seriously, I know of no studies that have focused on prey items of BCC in the Northern Sheild. The only studies have been on Island Boas off Central America. So in short, the only way for you to get a difinitive answer is to go and do the reasearch yourself.

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