Canon EOS RP + Canon RF 800mm f11 lens
I love this lens for its portability, sharpness, colours, and contrast. It's price is super attractive for what it offers. I carry this on my bicycle trips. Yes it is that portable for a lens that provides this amount of focal reach.
Things to consider during your decision to buy this lens. i.e. deal breaker for some
Fixed aperture of F11. Consider it to be sunny day / golden hour lens
Minimum focus distance of 6m. Which is usually fine for most of us as birds usually keep their distance from us. You may miss those rare opportunity where a friendly birds comes really close to photographer