The Chestnut-capped Warbler was previously lumped with the Rufous-capped Warbler but they were split in 2021. The Chestnut one inhabits Central and northern South America whereas the Rufous-capped is mostly in Mexico and crosses over a bit south and north of the Mexican borders. I have seen the Chestnut ones a few times but only obtained half decent pics on my second trip to Colombia.
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