4K HD Wallpaper: Yellow-Orange Parrot
Actually, the real name of the parrot is Sun Parakeet or Sun Conure according to Wikipedia. The 4K picture was taken by Stephanie Ecate and can be downloaded completely free under CC0 license and use as desktop background, homescreen phone or in other projects such as blog articles, templates, apps...
Widescreen Desktop / Macbook (Retina): 2880x1800 (fits on: 2560x1600, 1920x1200, 1440x900)
High Definition HD 1080p: 1920x1080 (fits on: 1600x900, 1366x768, 1280x720)
Samsung Galaxy Tab & iPad: 2048x2048 (compatible with many tablets)
HTC, Samsung Galaxy & iPhone: 1080x1920 (compatible with many phones)