Research in the Warkentin lab examines the intersections of ecology, evolution, behavior, and physiology with development. We are particularly interested in hatching and metamorphosis as critical transition points where rapidly changing animals move between very different selective environments. More broadly, we study phenotypic plasticity, early life stages, the integrative organismal biology of amphibians, and predator-prey interactions. We ground our studies in field observations of animals in their natural environment and use a variety of field and laboratory methods to address the questions arising from those observations. Much of our work is Neotropical, based at the Smithsonian Tropical Research Institute in Panama. We have also studied local spring-breeding amphibians in Massachusetts.