One of the lessons we're learning during our month of focusing on sustainability is how important even the most deplored of creatures -- such as mosquitoes, or hyenas -- are to the health of our global ecosystem. We can also learn from the complex societies of hyenas about how humans evolved intelligence. Hyenas get a bad rap, but they're actually very interesting and, surprisingly, loving animals. Our guest, Sarah Benson-Amram, postdoctoral research in zoology and ecology at Michigan State University, studied hyenas for 2 years in the Masai Mara of Kenya, challenging them with "puzzles" to better understand how these highly social creatures figure out problems and learn from each other.