I’d bet human activity kills more…
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What the astroid didn’t finish we are trying.
Poor dinosaurs.
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And succeeding! 
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Try motion activated sprinklers. Harmless and just irritates them enough to go away.
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A customer had recommended this motion activated sprinkler to me. I haven’t yet done the research to identify it but he has pretty high deer pressure that he is trying to counter.
Edit: it is an Orbit 62100 Yard Enforcer.
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The reviews on Amazon seem very poor for that unit, (16% rated it at 1*). I generally try to avoid buying anything from Amazon that has more than 5% one star rating. YMMV. 
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I know, I read the same thing. That is a crazy number, isn’t it? I can attest to the fact I had a few neighbor’s cats roaming around my bird feeders waiting for some to land on the ground. I would always see different feathers on the ground.
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And don’t even get a notion of trying ‘TEMU’…as the Chinese are trying to eliminate Amazon and selling their junk cheaper than Amazon. Lots of people gullible.
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Amazon is just as dirty as Temu and A sells the same made in china junk as temu
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We had a large orange cat that made our deck its home.
I scared it away by accident by blasting a leaf blower into the garden hose hatch, and orange cat sprang up from that opening. Never saw it again.
Scaring this cat is something I regret. Next year I had a woodchuck body slamming my garden fence to go at my green beans and kale.
Having a cat, even a neighbor’s cat, is of benefit in rabbit and even woodchuck control.
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I cannot speak for the product itself, but I do have two things to offer: there is a slightly different model number (still from Orbit, and only 11% of those reviews are one star) which our venerable host has used a quantity of, and he might have something to offer up on the product. The other is that I have observed that product reviews on Amazon tend to be skewed on the negative end of the scale due to people being more inclined to give feedback when they had a negative experience instead of a positive one.
Said in reference to this post, whose Amazon link goes to the Orbit 62100, not the 62100Z.
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Yes that sprinkler was pretty reliable for me. Unfortunately the deer learned to adapt to them. If protecting a small area I bet they would work but I had a whole yard.
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I found that cedar waxwings are so determined to get honeyberries that they would sit right next to scare balloons, CDs, or streamers. I could approach them within a couple feet waving my arms before they would fly a short distance. I can wave my arms and yell at deer in my yard, and they often just stand and look at me. I don’t even consider buying any scare devices. Strictly nets or fences for me.
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Hey everybody, come over here, that crazy human is providing free entertainment!
It has been my experience that a rifle tends to eliminate “stand and look” deer from the breeding population.
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Or a crossbow if you aren’t able to use a gun!
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Orbit … Yard Enforcer… in use vid.
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