NYT: A new study says tigers have been squeezed to less than 7 percent of their historical range. Most of the estimated 3,500 tigers that still roam the wild live in 42 relatively contained enclaves in India, Sumatra and Far Eastern Russia, with a smattering in Malaysia, Thailand and Laos. But those so-called source sites are losing ground to development, forestry and poaching and must be protected to save the tigers from extinction, according to a new paper from a group of …