The top two are blackbirds and the third looks like a song thrush. Do you own a cat, or do you feed other peoples' cats?
I should have also asked if they're directly under windows or patio doors. The photos show at least two different areas of ground, so I was assuming they aren't.....not impossible though. Collision into glass in sunny weather is a less likely possibility to a cat. Mass collisions seem too much of a coincidence, esp if they've only started recently.
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