closeup head on portrait of black caiman melanosuchus niger entering water from riverbank in the pampas del yacuma, bolivia

alligator amazon amazonas america animal animals black bolivia caiman camouflage carnivore closeup croc crocodile danger dangerous del destinations entering eye forest gator head jaws melanosuchus mouth nature niger pampas portrait predator reptile river riverbank rurrenabaque scales scary skin south teeth travel water wild wildlife yacuma