Geographically, ornithologists have found that several species build their nests with more deliberation in the tropics than do their nearest relatives in temperate regions. The Great Kiskadee Flycatcher requires 24 days to build their nests. Both male and female work on the nest. The nest is an untidy globe of grasses, weed stems, mosses, and feathers in a thorny tree and is entered through an opening on the side.