All photos were taken in Wisconsin, May of 2023, unless otherwise noted. ![]() My experience comes mainly from the Wisconsin lakefront, where there are still a good number of these terns around each spring. What I’ve done here is to try and compliment the info that’s already out there with more photos, to highlight the few field marks that I find to be the most powerful, and to discuss what complications occur with these field marks. There is already a great resource about Common vs. ![]() The field marks for these species are subtle and variable, however even when people put in time to learn the field marks, they may struggle if they don’t know what to prioritize. Common Tern and Forster’s Tern are subtle birds that create a lot of confusion for birders, especially in places like Chicago where we see them both in small numbers during migration.
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