My wife and I were admiring an image of the strange-looking bird called the nightjar when she asked me, naturally enough, what the “jar” in its name meant. I, naturally enough, turned to the OED, whose entry was revised in 2003:
1.a. A nocturnal, insectivorous, migratory bird, Caprimulgus europaeus (family Caprimulgidae), of Europe and eastern and central Asia, which has grey-brown cryptic plumage and a distinctive churring call. Also called fern-owl, goatsucker.
1630 Ill boding Owles, Night-iarrs, and Rauens with wide-stretched throats.
T. May, Continuation Lucan vii. sig. K4
[…]
1991 Suddenly another sound begins, completely evoking the spirit of the ancient heath—the hypnotic ‘churr’ of the nocturnal nightjar.
Bird Watching June 75/3
It has this interesting etymology:
The second element in the name reflects the bird’s distinctive call; compare other (chiefly regional) names for the bird, as churn-owl n., churr owl n., eve-churr n. 2, eve-jar n., jar-owl n., nightchurr n. Many similar imitative formations for the name of this bird are found in other languages.
(It would be nice if they’d mentioned some of those imitative formations.) If we turn to the synonym goatsucker (entry revised 2016) we find an equally interesting etymology:
< goat n. + sucker n.,
after classical Latin caprimulgus (Pliny; < capra she-goat (see capriole n.) + mulgēre to milk: see milk v.),
itself after ancient Greek αἰγοθήλας (< αἰγο-, αἴξ goat (see Aegipan n.) + θηλάζειν to suck).
Compare goat-milker n.
Whence also the Russian козодой ‘goat-milker.’
You can hear “the bird’s distinctive call” here.
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