Infestation of whale lice (Cyamus scammoni) in the blowholes of a gray whale calf (Eschrichtius robustus). Whale lice are amphipods that scavenge for food on the whale's body, including the whale's skin and flesh. 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. Photographed in Baja California, Mexico.
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