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Abstract
Information on the nests (for reproduction and dormitory) and eggs of Cabanis's Wren Cantorchilus modestus and Isthmian Wren C. elutus is incomplete and limited to old records. Here, I describe quantitatively the reproductive nests and eggs of both species, and dormitory nests of Cabanis's Wren. Reproductive nests of both species were similar in size and structure: globular, with a lateral circular entrance, nests sometimes have an entrance tail and are a very dense structure made of dry vegetation fibers. However, Cabanis’s Wren dormitory nests were highly variable in their form (e.g., closed globular, low cup, and platform), with a weak structure of dry vegetation fibers that allowed an easy view of the interior from outside. The eggs were plain white, similar to those of other species within this genus.
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