What's more fun that swimming? Swimming upside down. This humpback whale (Megaptera novaeangliae) has it right.
Mon Aug 14 09:54:39 2017
25°C, depth 1 m
Vava'u Island Group, Kingdom of Tonga
f/2.2, 1/1600, ISO 125, 24 mm
Wet lens: AOI UWL-09 Wide Angle