There is one thing that, strangely, does nothing for him: the sounds of other cats meowing. I tried to elicit a reaction using cat videos on Youtube, but he just doesn't care at all for the sounds. Is it possible he knows they're not coming from a real cat?
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My cats do not react to any of the sounds in a video either. I have tried many videos on YouTube, different sounds in apps and games, and even videos posted on Facebook. There is never a reaction from neither of my cats. I think they know the sounds, whether they are purring, meows, or hissing, are fake. Maybe they sound too electronic or odd to their ears. I just think they are smarter than what we give them credit for sometimes!