Nikkor 200-500 VR/TC 14 III @550mm, f8, high ISO (4000); Nikon D750 Black-mantled tamarin; apart from insect and fruit, always looking for sap of a favourite tree. It seemed to be breaking off pieces of bark using hands (they can’t use their teeth like marmoset) working on the existing holes (Saguinus nigricollis; it may look like it but not graellsi, whether sp. or ssp. - on the Peruvian border)
Sigma 50/1.4 A @f8, ISO 450, after a storm, Nikon D600 Amazon; Pink dolphins hunt for fish in these waters, you should see them splashing and blowing air (spout) a few times a day when moving along the river observing.
Sigma 50/1.4 A @f3.5, ISO 360; Nikon D600 about sunset, Amazon Vast network of rivers/open lakes exposed to substantial changes in water level, pulsating with rains and floods.