Like many of the antshrikes in the genus Thamnophilus, they are heavily sexually dimorphic with the males being mostly black-and-white and the females chestnut-and-black-and-white. We saw both the male and female on my last trip to Colombia but I only captured the female and with a stick in her face so I am eagerly awaiting another opportunity. They are only found in Colombia and Venezuela but have a pretty wide range.
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