About Chordeiles nacunda (Vieillot, 1817)
The nacunda nighthawk (Chordeiles nacunda) is not only the largest of the highly aerial nightjars classified as nighthawks, it is also the largest nightjar species in the Neotropics and one of the largest nightjar species in the world. Its body length ranges from 27.5 to 32 cm (10.8 to 12.6 in), which is somewhat shorter than that of the great eared-nightjar, the species typically considered the largest in the nightjar family. However, the nacunda nighthawk may actually have a slightly higher average body weight. Six measured nacunda nighthawk specimens had an average body mass of 159 g (5.6 oz), with a mass range of 130 to 188 g (4.6 to 6.6 oz). The nacunda nighthawk is easy to identify by its very large size, large head, pale body, and highly contrasting black primaries. This species is notable for having partially diurnal activity habits. Although it is a capable aerial forager, the nacunda nighthawk spends a considerable amount of time on the ground. It has notably long tarsi for a nightjar, and is more likely than other nightjar species to be seen standing on the ground rather than resting flat against the ground surface.
