CAYENNE TERN Thalasseus acuflavidus

Examples of the southern race of Cabot's Tern. 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 acuflavidus occur in a cline, so it may not be a good species, but all yellow-billed birds do show minor differences.

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