Cyamids

Cyamids, or whale lice, appear in a close encounter with a whale as small parasites whose presence complicates the boundary between harm and possible assistance. They feed on the host’s dead skin, may themselves be carried to food, and leave a dying whale on the beach.

Appearance and Location

During a whale’s close approach to a boat, the observer describes pale lice moving over its head. Their location coincides with the animal’s callosities: the rough patches that occur at points corresponding to hair growth on a human face, including the brow, chin, and upper lip. Those callosities give each whale a distinctive physiognomy, while the lice make that surface a habitat shared by host and parasite.

Relationship with the Host

The lice feed on dead skin. Eric Joranson, a mate on whale-watch boats, reports that they can also colonize a human if given the chance and are difficult to dislodge. When a whale dies on a beach, they leave it, a change in the relationship between parasite and host that the passage compares to rats abandoning a sinking ship.

An Ambiguous Ecological Role

The account does not treat the lice only as burdens. Because they eat the same Copepods as the whale, they may help direct it toward food, acting as minute sensors. This possibility remains tentative: the passage suggests a potential service, not a proven function. Cyamids thus occupy an ambiguous place in the encounter, feeding on the whale while possibly contributing to its search for nourishment.