09 May '11, 4am

Human Activity is Causing Wildlife to Shrink

While research into the diminution of non-human life on Earth has been steeped in academic study, the logic behind the phenomena is actually quite simple. The largest animal specimens, like deer, are typically the most targeted by hunters -- which results in fewer big deer to pass their largeness genes to a new generation. Naturally, such a selective process would dictate deers grow smaller over time, or else face a greater threat to the species itself. Humans' love of the biggest of the bunch, of course, doesn't stop at deer. In fact, few of the largest animals on Earth, megafuana, have not been impacted by us. A report from Australia's ABC sums up our rich history of wiping-out our big animal brethren: More than 25,000 years ago, one megafaunal species -- we humans -- began to spread rapidly around the globe and in the process helped to wipe out about half of all land ma...

Full article: http://www.treehugger.com/files/2011/05/human-activity-is...

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