On the wing – Whiskered Tern unloads excess baggage

Pooping on the fly — a tern for the worse, or the ideal weight-loss solution? In flight, a Whiskered Tern (Chlidonias hybridus) unloads extra baggage by leaving a trail of guano. Defecation in flight probably helps optimise body mass for energy-efficient flight, especially after a bird has recently fed.  Whiskered…