
The Bengal tiger is one of the better protected varieties - but even that is in trouble
The cost of keeping tigers alive in the wild is about $80m (£50m) per year, say conservationists - but only about $50m (£30m) per year is being pledged.
The figures come from a new assessment that suggests targeting efforts in 42 selected breeding sites.
Building tiger populations in these sites would enable other areas to be re-populated later, the researchers report in the journal PLoS Biology.
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