Max Planck Institute for Developmental Biology 1 article published in JoVE Environment Assaying Predatory Feeding Behaviors in Pristionchus and Other Nematodes James W. Lightfoot*1, Martin Wilecki*1, Misako Okumura1, Ralf J. Sommer1 1Department for Evolutionary Biology, Max-Planck Institute for Developmental Biology Behavioral assays provide powerful tools for understanding neuronal function. Here we present several protocols for quantifying predatory feeding behavior found in the model nematode Pristionchus pacificus and its relatives. Additionally, we provide methods for analyzing predatory feeding adaptations including mouth structures and teeth.