东北虎
In the 1990s, some tigers were observed in the protected area, which had a Siberian tiger phenotype of a large head, pale pelage, white complexion, and wide stripes, and were therefore suspected to be Bengal-Siberian tiger hybrids. Billy Arjan Singh sent hair samples of tigers from the area to the Centre for Cellular and Molecular Biology in Hyderabad where the samples were analysed using mitochondrial sequence analysis. Results revealed that the tigers in question had a Bengal tiger mitochondrial haplotype indicating that their mother was a Bengal tiger. Skin, hair and blood samples from 71 tigers collected in various Indian zoos, in the National Museum in Kolkata and including the two hair samples from Dudhwa National Park were prepared for microsatellite analysis that revealed that two tigers had alleles in two loci that were contributed by Bengal and Siberian tiger subspecies. However, samples of two hybrid specimens constituted a too small base to conclusively presume that "Tara" was the source of the Siberian tiger genes.