Saiga Antelope
(http://i34.tinypic.com/24g216o.jpg)
One of the world's most distinctive looking animals, the Saiga Antelope lives in dry steppes and semi-desert grasslands of Central Asia. It was well protected from poaching in the former Soviet Union, and populations were in the millions. Since the collapse of the Soviet empire management of the population has broken down, and poaching, habitat degradation due to over-grazing by sheep have caused steep drops in population. Since the average lifespan of the Saiga Antelope is only three or four years, if females don't mate every year (a possibility because males are poached at higher rates than females) then rapid declines in numbers can easily occur.