North America's prairies once were home to millions of wild animals. Today, most of that land is farmed or developed, but some grasslands have never been plowed and could be rewilded.
Male lions are responsible for the movement of genes between prides. New research confirmed that the genes are traveling long distances – even though no one has been spotting the lions on the journey.
Many mammals depend on large areas and trans-boundary conservation for their survival. When this is obstructed it can have a catastrophic impact on animal populations.