CAYENNE TERN Sterna (sandvicensis) eurygnatha

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Two examples of the aforementioned (sub)species. As well as the bill being yellow, there also seems to be much variation in size and shape. The adult bird here has a bill shaped more like an Elegant Tern, whereas the flight shot, albeit a young bird, has a short bill. Intergrades with Sandwich do occur in a cline, so it may not be a good species.

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