This bird poops only while flying.

Streaked shearwaters were filmed with belly-mounted cameras on 15 birds, with nearly 200 defecation events recorded. The birds almost always pooped while flying rather than floating on the sea. 1 They pooped every 4–10 minutes in daylight, and the team estimated about 30 grams per hour, roughly 5% of body mass. 2

The paper leaves the reason open. Cleaner feathers, less predator attention, or an easier posture are possible explanations, not settled results. 1

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