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Gull-billed tern? (From Belize)

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These are not good photos but hopefully enough to ID the tern. The expected terns in this location are Caspian tern, Forester's tern and Gull-billed tern.

- Based on bill-shape, I think we can safely rule out Caspian tern. 

- The bill-shape seems okay for Forester's tern but it does not have the orange bill of breeding adult (and the full black cap suggests that its past the non-breeding phase)

- The black bill color seems to match the Gull-billed tern. However, the bill looks a little too thin for me. 

Any thoughts?


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