Wildlife in Wales is at a crisis point, says a report being published by 25 conservation groups.
The State of Nature study claims to be the first “stocktake” of native species undertaken across the UK.
Over the last half century, 60% of species studied have declined, with one in 10 facing extinction.
The study’s authors said wildlife in Wales was facing increasing pressure, with the next decade likely to be “a tipping point” unless action was taken.
The report is being launched at simultaneous events in Cardiff, London, Edinburgh and Belfast on Wednesday evening.