Use "ululation" em uma frase

1. A stunned silence lasted for a long minute before the full import of Uretep’s words hit them and a deep ululation filled the Arena

2. Then with one frenzied crescendo of inhuman ululation they stiffened and lay still, and Conan knew that they were dead

3. A hideous ululation caused him to glance over his shoulder as he reached the higher arch, to see the other servants streaming back into the cavern below, blood dripping from their bared fangs

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