Teddy Roosevelt

This is an encore interview and was originally broadcast in October 2014.

President Theodore Roosevelt’s dedication and perseverance led to the preservation of some of our greatest national parks, forests, monuments and wildlife sanctuaries. Thanks to Roosevelt’s vision and foresight, our children’s grandchildren can enjoy species that in a not-too-distant past were threatened with extinction, and visit natural areas that today remain as pristine and untouched as they were a century or more ago.

If Teddy Roosevelt were to go big game hunting today, he might bring home slightly less-impressive trophies. That's because, according to a new analysis, the horns and antlers of North American wildlife have shrunk over the last century.