My own photos (except on the rare occasion I use a phone) are 4:3 so not that far off square.
I think this works well, I’d never crop, I don’t have enough time to upload as it is. That is unless I’ve got something I don’t want in the photo, like a Homo sapiens in the background, or couldn’t get close enough, as in the bird example above, then i do go 1:1 I think. (Edit: No, I don’t, though I will now)
Below is a few of my more recent observations, comments welcome :)
https://www.inaturalist.org/observations/126593568
https://www.inaturalist.org/observations/116505953
https://www.inaturalist.org/observations/116500214 Cropped, but not 1:1
https://www.inaturalist.org/observations/111372875