There may have been a very dramatic population crash when this disease swept through, but some animals were hanging on. (discovermagazine.com)
From the early 2000s, spectacular population crashes — in some cases over 90 % — were recorded. (abc.net.au)
But they suffered two great population crashes, first toward the end of the 19th century and again in the last years of the 20th century. (dotearth.blogs.nytimes.com)