Harpy Eagle Adaptations

The Harpy Eagle's current known habitat is mainly within the rainforests of Southern and Central America. I believe that within the next century, these forests may be almost, if not entirely, dried out. My hypothesis is that the Harpy Eagle will become smaller, as a smaller frame requires less nutrients to operate. It may also gain some way to store water, in the same way that desert organisms such as cacti can, so that it can go longer without water. It might also start to blend with its changing surroundings more as the lush rainforests start to dry out, and the bright colors of its flora and fauna aren't as abundant.