Those groups were with my Savage boatman. I have a Weaver T36 for target shooting. I had it on my Savage for a long time but now it's on my CZ 453.
Crows are just tough as heck tCan. Plus they're smart too. It's hard to get a good shot at one because they post sentry's around where they roost. If the sentry lets a predator get past they are chased out of the murder (which is what a group of crows is called). The video shows what must have been the luckiest shot in history. Hitting something vital on a crow is no easy job even if you have a clear shot. But the fact the bird had enough sense to hide behind limbs shows how smart they are.
My guess is that crows in a lot of places have lost their fear of humans like other animals have (think squirrels in a city park). Where we lived crows knew if they got close to a garden they were going to be shot at. I'm just guessing here obviously. But I do know that killing crows is not nearly as easy as the guy in the video lets on. To kill one with a ricochet shot with a pellet is just crazy IMO. I looked around and found some suggested equipment for crow hunting on this page
and this page
. Both pages suggest using a shotgun with one saying a centerfire .22 is a good choice. Neither suggests an air rifle you can be sure. Obviously a good shot will bring down a crow with a .22 and so will a lucky shot. But keep in mind that this guy killed "one" crow and he did it from a blind because the crow had already learned that he was shooting at it. Crows learn very quickly. Hiding behind a tree limb is more evidence of their intelligence.
I knew a family that actually had a pet crow once. The thing got hurt when it was young and they fed it and nursed it back to health. Once healthy it just decided to stay I guess. That crow learned to talk very well if that tells you anything. It was illegal to keep a crow as a pet but they couldn't run the thing off. It liked free food I guess. Whatever the case it died there of old age. They know which side their bread is buttered on I guess. Crows are smart, tough animals and I'm really impressed that someone managed to kill one with a lucky shot from a pellet gun. Trust me they don't all fall that easy.
To be honest I think he might have actually shot a raven. It looks pretty small to be a crow. An American crow is 16" to 20" tall. That bird in the video doesn't look that big and ravens look almost identical to crows. Look at the 2:47 point in the video. That bird just doesn't look big enough to be a crow. Also a raven's bill is larger in proportion to it's body. A crow has a substantially smaller bill proportionally. I'm convinced the video is a killed raven to be honest. Their behavior is very similar to the crow but their size isn't and neither are their beaks. Here is what a crow looks like. The photo is from Wikipedia.
Notice the smaller looking beak. Also notice the feathers appear much smoother on a crow.