Observations on the nesting of Scissor-tailed Nightjar Hydropsalis torquata in eastern Santa Fe province, Argentina

Abstract

We offer a contribution to the knowledge of the reproductive biology of Hydropsalis torquata based on four nests from middle Paraná river floodplain, Santa Fe province, Argentina. Three nests had eggs and one nest had juveniles. Three out of the four nests were located in natural habitats. Eggs were elliptical or ovoid, light pink or creamywhite, spotted and scrawled with ochre and brownish grey. The incubation period lasted 18 days in one nest. Chicks were covered by cinnamon coloured down with dark spots distributed on its surface. Juvenile plumage was similar to adult male plumage. Eggs and chicks were incubated and bred by females; males were not seen on the nest. Defense and distraction displays are also described.