Whale lice are amphipods that scavenge for food on whales’ bodies, including consuming skin and flesh of whales. This species (Cyamus scammoni) lives exclusively on gray whales (Eschrichtius robustus). There is sexual dimorphism among adult Cyamus scammoni, with males being larger than females. Unlike the young of most other marine crustaceans, which have a planktonic larval stage, juvenile whale lice mature in a pouch-like structure called the marsupium, which is located on the underside of females. There is a small whale louse visible on the right side of this large amphipod’s head, hidden between the head and the forward right appendage. Photographed in Baja California, Mexico.
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