Nikkor 200-500 VR/TC 14 III @700mm, f8, ISO 720; Nikon D750
The shine of Amazon river dolphin body/dorsal fin (Inia geoffrensis);
Splashing and spouting are part of flooded forest sounds (rarer to hear in full flood).
Sudden glimpses of pearl-grey/pink parts of their bodies are all you can see while they are hunting.
Here (all of our shots were shot deep in NP), the dolphins live relatively
undisturbed lives both in narrow and vast watercourses.