Massive Casque of Oropendola in Full View Chestnut-headed Oropendolas are a common visitor at the Panama Fruit Feeder at Canopy Lodge. Often they arrive in small groups of 6-8 birds, foraging busily around the table like this individual. The wispy crest on this oropendola is typical for Chestnut-headed Oropendolas, as is the massive swollen casque that makes its bill so large. These relatives of orioles and blackbirds create large woven nests over a meter in length, nesting in colonies that can