Gilma, you should notice they have the same specific epithet, just two different genera. That is because one is the old Genus, and people decided to move it to another Genus, so one is the new Genus. Both are technically correct and mean the same bird, just one is more recent.
Thank you for the ID, Fyn Kynd. I am a bit confused with the Tennessee Warbler Oreothlypis peregrina and the Tennessee Warbler Vermivora peregrina, is it that the bird has two Scientific names?! I can not see any differences between them in the Internet?
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