Watching a Caspian Tern (our largest tern) feeding in deep water is a lesson in persistence and grace. Flying back and forth it circles the water below, its bill pointed down as it searches for fish. A Caspian Tern’s dive is impressive. Once a tern sees a fish it hovers briefly, flexes its wings and then plunges straight down like a bullet. When it hits the water, it typically completely submerges itself.
Most fish captured are consumed on the wing, unless they are delivered to offspring. Fish bones and scales are difficult for terns to digest; they solve this situation by casting one or two pellets a day that consist of these indigestible parts.
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