Birder’s Eye View: One good ‘tern’ deserves another.
The terns that normally visit our coast come in three sizes — large, medium and small. The largest is the Caspian tern, followed closely by the royal tern. The mediums include Sandwich, gull-billed, Forster’s and common. In the “small” category we have black and least.
http://www.blufftontoday.com/news/2017-09-26/birder-s-eye-view-one-good-tern-deserves-another
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