vertical wall. The clutch size is one to four eggs. Both parents incubate the eggs and care for the young. The incubation period is about 24 days and fledging occurs about 33 days after hatch. Vocalization The biscutate swift's principal vocalization is described as "chee chee chee chee chee..." or "weep-weep-weep". Status The IUCN has assessed the biscutate swift as being of Least Concern. It has a large range, but its population size is unknown and believed to be decreasing. No immediate threats have been identified. "No direct effects of human activity on the Biscutate Swift have been documented" but collisions with wires, bioaccumulation of pesticides, and changes in insect populations due to climate change are possible threats. References biscutate swift Birds of Brazil Birds of the Atlantic Forest biscutate swift biscutate swift Taxonomy articles created by Polbot