 It was proved later that Twycross Zoo had been irresponsible and maintained no breeding records, and had given India a hybrid Siberian-Bengal tigress instead, although at the time, and taking into account information received regarding all of the tigers kept at Twycross Zoo, it was believed that Tara was a pure Bengal tiger at that time.Dudhwa tigers constitute about 1% of India's total wild population, but the possibility exists of this genetic pollution spreading to other tiger groups; at its worst, this could jeopardize the Bengal tiger as a distinct subspecies.With the advent of co-ordinated breeding programmes for numerous species help in captivity and standardised electronic animal record keeping systems (ARKS), it is now possible to track the different subspecies that are managed and ensure that these are managed as pure subspecies.