Hmm yes anything that is wider is good for landscape shots. For bird photography and animal shots I would use something like 16:10 as this is a film look.. and if you place the bird in such way that the composition adds to the subject you can make a nice photo out of it.. I personally don't like square format because it is so "product" like.. if you know what I mean with that. But don't limit yourself with crops and standers you should crop or not the way you like it .. or more exactly what suits the image.
Thank you so much for all advices. When I've started to crop pictures, I did because I was focused on a small objects and I wish to show it bigger and nearer. With better lens I tryed to catch the whole composition, without cropping in postproduction and now I am looking for interesting and eyecatching formats. It seems I must go back to the beginning