on pre-Colombian ruins. The clutch size is two to four eggs. The incubation period is thought to be about 30 days, fledging occurs about 35 to 40 days after hatch, and young are dependent on the parents for at least 12 weeks after fledging. Both sexes incubate the eggs with the female doing at least 75% of the effort and in some areas all of it. Males provide food for incubating females and also most of the food for nestlings. Vocalization The bat falcon is vocal "in breeding season, especially near nest, in contacts with other raptors, and even when attacking prey." Its main call is a "rapid shrill screaming" kee-kee-kee.. or kew-kew-kew..; the male's is higher pitched than the female's. Other calls include "an even higher and thinner “tsee-tsee-tsee...”", a "low-intensity “chit” given in contact", and by the female, "a whining or high-pitched wailing call with a wavering quality". Status The IUCN has assessed the bat falcon as being of Least Concern. It has an extremely large range and an estimated population of at least a half million mature individuals, though the latter is believed to be decreasing. No immediate threats have been identified. It is "[w]idespread and generally not uncommon in appropriate habitat, it being one of the most widely distributed New World falcons." But it "no longer breeds in several areas where forest extensively transformed to agriculture" and "pesticides [have] unquestionably affected breeding success" in Mexico and Central America. References External links Stamps (for Suriname) with RangeMap Bat Falcon photo gallery VIREO Article oiseaux Falco (genus) Birds of Central America Birds of Mexico Birds of the Yucatán Peninsula Birds of South America Birds of the Amazon Basin Birds of the Guianas Birds described in 1800