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ululate \UL-yuh-layt; YOOL-\, intransitive verb:
To howl, as a dog or a wolf; to wail; as, ululating jackals.
She used harrowing, penetrating nasal tones and a rasp that approached Janis Joplin's double-stops; she made notes break and ululate.
-- Jon Pareles, "On the Third Day There Was Whooping and There Was Moshing", New York Times, August 18, 1998
Or perhaps:
Passing the property developers house at the cusp of dawn, the stillness of the moment was shattered. Above, behind smoked glass railings, a group of shirtless former All Blacks were ululating in unison.
-- Mark. E. Fellis Getting To Know Susan Of Herne Bay, Parnell Press 2005