Screaming
If the un-spayed female is outdoors, then her caterwauling is meant to draw a male, and then mating will occur. She will take a lordosis position while the male bites her neck and starts the mating process.
Moreover, cats in the midst of a fight might scream, too. These primeval shrieks might come after a long and ominous yowl, and they usually punctuate a climactic paw swat or even a vicious bite.
Stray cats are way more likely to fight, but even fixed pets might actively feel the need to defend their territories. To avoid fighting injuries to your cat, you might want to keep them indoors.
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