<p>Ellen Welti explains how grasshoppers in a Kansas prairie could be in decline even with abundant grass.</p>

How marine reptiles moved from land to sea

Welcome to Science Sessions, the PNAS podcast program. Listen to brief conversations with cutting-edge researchers, Academy members, and policymakers as they discuss topics relevant to today's scientific community. Learn the behind-the-scenes story of work published in PNAS, plus a broad range of scientific news about discoveries that affect the world around us.