closeup of black caiman melanosuchus niger head with jaws open showing teeth in the pampas del yacuma, bolivia

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