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Ducks have ducklings, so naturally, cows have cowlings.

Thanks!

One of the early accomplishments of "NASA", long before it became NASA, was the development of an improved cowling for airplanes: https://en.wikipedia.org/wiki/NACA_cowling

Thanks! I was just excited about experiencing the frequency illusion in real life -- fifteen-ish years of English without cowling, then two cowlings in a day from two different sources.

It is a fairly common term in automotive domain.