"The 1DX3 is not made for weddings and funerals;..."
That is good to know. I didn't buy a 1Dx Mk III, yet, and I am glad I didn't since they can't be used for weddings. I am thankful the 1DX was the last 1 series that can be used for such. The many hundreds I did with a 1 series would have not been possible, whew! My lucky stars!
" I do not understand how people can use one for wildlife photography."
Neither do I, how do we manage? 
@ebiggs1 wrote:"The 1DX3 is not made for weddings and funerals;..."
That is good to know. I didn't buy a 1Dx Mk III, yet, and I am glad I didn't since they can't be used for weddings. I am thankful the 1DX was the last 1 series that can be used for such. The many hundreds I did with a 1 series would have not been possible, whew! My lucky stars!
" I do not understand how people can use one for wildlife photography."
Neither do I, how do we manage?
I had much smaller wildlife in mind, which usually means you need to be MUCH closer.
With a lot of wildlife, it is going to be either their vision or sense of smell rather than the sound of the camera that sends them on their way. I saw this hawk having a late lunch in my front yard a short time ago but it flew away when I was around 200 feet away and he was watching me long before the first time I triggered the shutter. Had I gotten there before his meal was mostly finished I probably could have gotten closer.
The shutter is louder with a 1 series than some of the other bodies but it isn't often going to be the deciding factor for wildlife.
Shot with 1DX III, EF 400 F2.8 plus 1.4X @ 1/1600, F4, ISO 250. I triggered off several captures but getting closer wasn't in the cards because the quarry had "eyes on" from the moment I stepped around the house.
Rodger
@wq9nsc wrote:With a lot of wildlife, it is going to be either their vision or sense of smell rather than the sound of the camera that sends them on their way. I saw this hawk having a late lunch in my front yard a short time ago but it flew away when I was around 200 feet away and he was watching me long before the first time I triggered the shutter. Had I gotten there before his meal was mostly finished I probably could have gotten closer.
The shutter is louder with a 1 series than some of the other bodies but it isn't often going to be the deciding factor for wildlife.
Shot with 1DX III, EF 400 F2.8 plus 1.4X @ 1/1600, F4, ISO 250. I triggered off several captures but getting closer wasn't in the cards because the quarry had "eyes on" from the moment I stepped around the house.
Rodger
The keywords here are "with a lot of wildlife", which is true.
Shooting wildlife reminds me of fishing. I do not walk up on the subjects, and take photos. I usually throw my hook in the water and wait for the fish to bite. Chipmunk is a perfect example. I found a quiet, dark spot in the woods, and waited for them to come back out from hiding..
I love the sound of a 1D Series shutter. KA-LACK goes the shutter on my 1D M4. The smaller critter do not.
More times than not, the first shot is the only shot I might get. This Cedar Waxwing was singing its' heart out the shutter broke the background silence of its' song.
"...usually means you need to be MUCH closer."
I was actually, too, close to the Big Horn sheep ram. If I recall I was shoting at 75mm! I shot around 20 frames while he watched me. The big guy thought I was to close. He and I came to the same conclusion we need to seperate. So, I did.
The elk was shot with 200mm. I was in a make shift blind.
