Black caiman at water surface with horse flies feeding above its eye, Yasuni National Park, Orellana, Ecuador.

Black caiman (Melanosuchus niger) at water surface with horse flies feeding above its eye, Yasuni National Park, Orellana, Ecuador.

Black caiman (Melanosuchus niger) at water surface with horse flies feeding above its eye, Yasuni National Park, Orellana, Ecuador.