Quantitative Description of Nests and Eggs of the Isthmian Wren Cantorchilus Elutus and Cabanis's Wren C. Modestus

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.