NOV 21, 2018
The History of the Oceans Is Locked in Whale Earwax
Whales are big, whales are long-lived, and whales have paddle-shaped flippers instead of dexterous hands. These three traits inexorably lead to a fourth: Over time, whales accumulate a lot of earwax.
Whale earwax forms like yours does: A gland secretes oily gunk into the ear canal, which hardens and accumulates into a solid, tapering plug. In the largest whales, like blues, a plug can grow up to 10 inches long, and looks like a cross between a goat’s horn and the world’s nastiest candle. Fin whale wax is firmer than blue whale wax, bowhead whale wax is softer and almost liquid, and sei whale wax is dark and brittle. But regardless of size or texture, these plugs are all surprisingly informative.
As whales go through their annual cycles of summer binge-eating and winter migrations, the wax in their ears changes from light to dark. These changes manifest as alternating bands, which you can see if you slice through the
