Quebracho Crested-Tinamou Eudromia formosa

  • Order: Tinamiformes
  • Family: Tinamidae
  • Polytypic: 2 subspecies
  • Authors: Paul Smith
Sections

Breeding

There is very limited information on the breeding biology of Quebracho Crested-Tinamou. Steinbacher (1962) mentions two females collected in Paraguay by the Paraguayan Mennonite collector Jakob Unger in November 1955 with well developed gonads and declared this to be indicative of a discrete breeding season. A male collected on 13 March 1957, however, also had well developed gonads, and Unger collected a "partly grown immature female" in December (year not given) (Short 1976). Smith et al. (2013) reported a female with internal eggs from Paraguay in July (midwinter). Cabot (1992) notes that birds collected in February in Argentina were in breeding condition and a bird collected 60 km north of Fuerte Esperanza, General Guemes department, Chaco province, Argentina during August had an egg in its oviduct, supporting the possibility of year round breeding throughout the species range.

Steinbacher (1962) quotes Unger in describing the eggs as green and the clutch size as 7-9 eggs. However the statement that nests are "normally located near the road", likely reflects the ease with which roadside nests could be located in areas of otherwise dense thorn forest. Smith et al. (2013) include a photograph of a uniformly lime-green, ovoid egg, half-extruded from the cloaca of a dead bird found on a roof top. The egg measured 36 mm at its widest point (still intact) and the total length was estimated at approximately 65 mm, though the largest fragment was only 51 mm long; longer and thinner than published measurements for Elegant Crested-Tinamou E. elegans 57.1 mm (+/- 0.97) x 39.4 mm (+/- 0.45) (Davies 2002).

De la Peña (1978) provides measurements of ca 53-55 x 40-41 mm for Quebracho Crested-Tinamou, with a clutch of up to eleven lustrous yellowish eggs. It seems likely, however, that these eggs were sun bleached, and the dimensions are consistent with Elegant Crested-Tinamou.

Recommended Citation

Smith, P. (2014). Quebracho Crested-Tinamou (Eudromia formosa), version 1.0. In Neotropical Birds Online (T. S. Schulenberg, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/nb.quctin1.01