The design of a D-SLR type camera makes it most comfortable to hold horizontally, with the long edge of the frame parallel to the horizon. Consequently, it is all too easy to end up shooting all of your pictures in what is often referred to as the “landscape” format.
Most magazine and book editors prefer vertical pictures shot in the “portrait” format; it has been estimated that 65% of published pictures are in this form.
Regardless of whether or not you are shooting with a view to publication, just by taking some pictures in the vertical format you will have pictures that will stand out from those shot by many other photographers. By using the vertical format you will also be exercising your creativity a little more, since many wildlife subjects tend to fit more readily into a horizontal frame, with the exception of an animal such as a giraffe!
So, make it a point to shoot more vertical images!
Eurasian Lynx, Bavarian Forest National Park, Germany
Technical details: Nikon D3s, AF-S 200-400mm f/4 (400mm), 1/125 f/4 ISO400