Biology professor Karen Warkentin and Engineering professor J. Gregory McDaniel collaborate to study the vibration-cued escape-hatching behavior of treefrog embryos. They designed a new vibration-playback system to answer previously intractable questions about how embryos use information. The first paper using this new tool, published online in Behavioral Ecology and Sociobiology with PhD student Julie Jung and collaborator Luis Alberto Rueda Solano, reveals that how embryos use vibrations to assess danger changes as they develop, in ways that match adaptive predictions. Less and more developed embryos both use vibrational information to make life-and-death decisions, but they do so in different ways that make sense based on the different risks they face if they make mistakes. This reveals a new level of complexity in embryo information use and behavioral decisions.