It's actually quite challenging to get a shot of otters. They are not only socially active but they are almost constantly on the move, writhing around one-another and suddenly darting off to a different group.
I was playing with the Sigma 60-600s and the R5, and managed to get this moment of a couple bonding. The first shot is the full image, and the second is the heavily cropped version, showing how clear the reflections in the facing otter's eyes are. Both benefit from the animal eye focus lock.
