4K HD Wallpaper: Nile Crocodile
The biggest reptile - Nile Crocodile - in a free CC0 image optimized here for use in desktop backgrounds, homescreen phones, blog articles about crocodiles, apps... from courtesy of the German photographer Monika.
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)