Staffan Widstrand / Hoatzin birds (Opisthocomus hoazin) perched on branch, Napo wildlife lodge, Amazonas, Ecuador, South America, April.

Staffan Widstrand / Little green heron or Striated heron (Butorides striatus / virescens) catching insect, Napo wildlife lodge, Amazonas, Ecuador, South America, April.

Staffan Widstrand / Hoatzins (Opisthocomus hoazin) on branch, Napo wildlife lodge, Amazonas, Ecuador, South America, April.

Staffan Widstrand / Hoatzin (Opisthocomus hoazin) Napo wildlife lodge, Amazonas, Ecuador, South America, April.

Staffan Widstrand / Hoatzin (Opisthocomus hoazin) feeding on leaves, Napo wildlife lodge, Amazonas, Ecuador, South America, April.

Staffan Widstrand / Squirrel monkey (Saimiri sciureus) feeding, Napo wildlife lodge, Amazonas, Ecuador, South America, April.

Pete Oxford / Tourist on canopy walkway at Sacha Lodge, Napo River, Yasuni National Park, Amazon, Ecuador

Pete Oxford / Interior of a hut at the Napo Wildlife Centre Lodge, Añangu Lake, Yasuni National Park, Amazonia, Ecuador

Pete Oxford / Restaurant with view over the lake at the Napo Wildlife Centre Lodge, Añangu Lake, Yasuni National Park, Amazonia, Ecuador

Pete Oxford / Tourists in canoe at Napo Wildlife Centre Lodge, Añangu Lake, Yasuni National Park, Amazonia, Ecuador

Pete Oxford / Napo Wildlife Centre Lodge, Añangu Lake, Yasuni National Park, Amazonia, Ecuador

Pete Oxford / Napo Wildlife Centre Lodge, Añangu Lake, Yasuni National Park, Amazonia, Ecuador