In a classic illustration of: "What goes in must come out", here's a juvenile star pufferfish (Arothron stellatus) grabbing a treat:
Juvenile star pufferfish eating
…then getting serious about the task at hand:
Juvenile pufferfish really chowing down
…and finally, defecating in my general direction:
Juvenile star pufferfish taking a dump
I don't know what it is that makes animals want to poop around, in front of, or at me, but as long as it's happening, I might as well photograph it, right? (Note: See Shrimp Poo and Whale Poo).