Ululation

The overthrown Martian set up a prolonged ululation, and immediately a second glittering giant, answering him, appeared over the trees[.]

Source: wiktionary

As we started there broke from the thick silent woods behind us a sudden great ululation of the ape-men, which may have been a cheer of triumph at our departure or a jeer of contempt at our flight.

Source: wiktionary

Because it is not as reliable as the simple ululation or the louder cross-register ululation, it should be allowed a certain amount of preparation time.

Source: wiktionary

Maryam, my research assistant, and I were going through some interviews we had conducted the previous day, when cheerful ululation disrupted our discussion. Coming from the culture of north Sudan, where such ululation may announce the happy news of a wedding or a circumcision, I assumed a similar situation was taking place […]

Source: wiktionary