The Mangrove Rail (R. longirostris) and King Rail (R. elegans) are in a long zone of secondary contact in the eastern USA along which hybridization occurs (Maley & Brumfield, 2013).
Several hybrids have been produced in captivity by means of artificial insemination, for example White-naped crane (G. vipio) x Siberian Crane (G. leucogeranus) hybrids (Maksudov & Panchenko, 2002). For experimental purposes (DNA fingerprinting protocol), hybrids were also obtained between Siberian Crane and Sandhill Crane (G. canadensis) (Tokarskaya et al., 1994).
A population genetic study of Sarus Crane (G. antigone) revealed the Indian and eastern subspecies represent major breeding groups and that the Myanmar population probably resides in an introgression zone between them (Jones, Barzen & Ashley, 2005).
Jones, K. L., Barzen, J. A. & Ashley, M. V. (2005). Geographical partitioning of microsatellite variation in the sarus crane. Animal Conservation 8, 1-8.
Maksudov, G. Y. & Panchenko, V. G. (2002). Obtaining an interspecific hybrid of cranes by artificial insemination with frozen-thawed semen. Biology Bulletin 29, 196-199.
Maley, J. M. & Brumfield, R. T. (2013). Mitochondrial and Next-Generation Sequence Data Used to Infer Phylogenetic Relationships and Species Limits in the Clapper/King Rail Complex. Condor 115, 316-329.
Tokarskaya, O. N., Kalnin, V. V., Panchenko, V. G. & Ryskov, A. P. (1994). Genetic Differentiation in a Captive Population of the Endangered Siberian Crane (Grus-Leucogeranus Pall). Molecular & General Genetics 245, 658-660.