Almost a quarter of eucalypt trees found to be threatened with extinction

Some 134 species of eucalypts had drops in numbers of at least 30% and the endangered Rose Mallee declined by more than half

A global assessment of all 826 known species of eucalypt trees - of which some 812 grow only in Australia - has found almost a quarter are threatened with extinction.

The figures are revealed in the International Union for Conservation of Nature's update of its "red list" of threatened species.