For my Master’s thesis, I am investigating the underwater movement and foraging patterns of wild California sea lions. I am approaching this goal from two angles. First, I am working with trained sea lions at SLEWTHS (here in Moss Landing) to understand how accelerometers can be used to identify when sea lions make feeding attempts.This study will provide a method by which researchers can figure out where, in a dive, wild sea lions catch prey.Second, I am analyzing movement, energy expenditure, and foraging data from wild California sea lions at San Nicolas Island, CA. The idea here is to get high-quality instantaneous measurements of metabolic energy expenditure from movement data (acceleration, magnetic compass bearing, rotational velocity) recorded by a small animal-borne datalogger. I hope this research will improve our understanding of sea lions’ underwater movements and foraging patterns, and how these patterns relate to energy expenditure during foraging trips to sea.