"Danger," says the sign on the door of a laboratory at the Australian Museum in Sydney: "Tasmanian Tiger, Trespassers will be eaten!" The joke is that the Tasmanian tiger—a beloved symbol of the island state that appears on its license plate—has been extinct for nearly seven decades. But researchers behind that door are working to bring the animal back to life by cloning it, using DNA extracted from specimens preserved decades ago. Among other things, the work raises questions about the nature of extinction itself.
RELATED CONTENT
The Tasmanian tiger’s Latin designation, Thylacinus cynocephalus, or "dog-headed pouched-dog," makes it redundantly clear that the marsupial’s feline nickname is a misnomer. It comes from the dark striping on its back that runs nearly shoulder to tail. The animal had large, powerful jaws, which secured the predator a place atop the local food chain. Females carried their young in backward-facing pouches.
Thylacines, once spread throughout mainland Australia and as far north as New Guinea, were probably outcompeted for food by the dingoes that humans introduced to the area some 4,000 years ago, says Australian Museum director Mike Archer, founder of the cloning project. Eventually, thylacines remained only on the dingo-free island of Tasmania, south of the mainland. But with the arrival of European settlers in the 1800s, the marsupial’s days were numbered. Blamed (often wrongly) for killing livestock, the animals were hunted indiscriminately. The government made thylacines a protected species in 1936, but it was too late; the last specimen reportedly died in captivity the same year.
Read on...
No comments:
Post a Comment