From The BBC:
Europe's largest mammal, the European bison, remains extremely vulnerable to extinction, despite long-standing efforts to save it, new research shows.
One of the two remaining wild herds of pure bred European bison is down to an effective population size of just 25.
That is despite the actual number of wild bison in the herd having steadily risen to around 800.
The effective population measures the bison's genetic diversity, and can help predict the animal's survival chances.
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