Or maybe they're more excited to see the male caregivers? Or maybe the male caregivers are louder themselves so they copy them? Or maybe...
"Greeting Vocalizations in [These 31] Domestic Cats Are More Frequent with Male Caregivers"
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You couldn't write a book containing the context needed to qualify a factual statement about any of these cats. It seems even the article authors couldn't be bothered, writing only 5 pages after failing meet their nonsensical objective.