>>4400299/p/ is wildly cantankerous, the bird threads are probably the only chill ones besides the resident bird hater.
>>4400289Even though I own a r6mkii I don't think I'd recommend some one new to go into canon's ecosystem with how restricted it is, especially if you're on a budget, the glass is pretty top tier but absurdly expensive.
I don't know much about other ecosystems so can only give advice for canon, but the canon r7 and the rf100-400 for a total of just under 2k(honestly one of the best value glass in general for telephoto) is a pretty damn good birding setup, isn't too expensive, and gives your room to grow glass wise while having a weather sealed body with IBIS. However you'll be fighting light with the apsc sensor and the slower glass. If you keep that in mind, you can get some great photos.
Here's a flicker link to check out some photos with that combo:
https://www.flickr.com/search/?camera=canon%2Feos_r7&safe_search=1&text=bird+rf100-400If you go this route, I'd try official canon refurbed for the body, and buy the lens new to save more money.
If I had to do it again from scratch, knowing what I know now I'd probably go sony for sigma/tamron lenses for a cheap setup. I just didn't like how they felt holding them in store, so I went canon. Some people bitch about the menus on sony but I had no problem navigating them in store, do prefer Canon's menu however. Do I regret going canon? Not really, incredible AF, and although the bodies are gigablobs they're comfortable to hold for hours with a telephoto due to it. Just sucks we won't have FF 3rd party lenses for a while for RF mount(if ever).
Regardless of what ecosystem, body, and lens you go with, nothing will beat getting closer to your subject with decent light. Doesn't matter if you have a 800mm gigaprime that costs the same as a house downpayment if you can't get close enough to the subject.
Whatever you get, practice and learn it's limitations, especially with ISO and work around that.
