June 13, 2023--Hosts Tim Bray and Bob Spies discuss marine mammal disease, with Dr. Padrick Duignan, Director of Pathology, Marine Mammal Center, Sausalito. Dr. Duignan talks about Leptospirosis in California Sea Lions, the recent gray whale mortality event in the Eastern Pacific, killer whale predation,  Narwhal population decline in the Arctic Ocean, and the widespread DDT contamination of the Southern California Bight. Woven throughout is the effects of climate change on these processes.