4K HD Wallpaper: Harris Hawk
Jeremy Cai took this picture and shared from his courtesy under CC0 license. Download from here if you like optimized for use in webdesign projects, blog articles about birds, social media, desktop backgrounds, homescreen phones...
Widescreen Desktop / Macbook: 1920x1200 (fits on: 1680x1050, 1440x900, 1280x800)
Samsung Galaxy Tab & iPad: 2048x1536 (compatible with many tablets)
HTC, Samsung Galaxy & iPhone: 900x1600 (compatible with many phones)