Ronis Da Silveira, William Ernest Magnusson, Zilca Campos, Monitoring the Distribution, Abundance and Breeding Areas of Caiman crocodilus crocodilus and Melanosuchus niger in the Anavilhanas Archipelago, Central Amazonia, Brazil, Journal of Herpetology, Vol. 31, No. 4 (Dec., 1997), pp. 514-520
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Silveira et al. (1997) studied this question.
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