4K HD Wallpaper: Vienna Zoo. Animals. Primate. Lemur.

Stefan Ledwina is the photographer and from his courtesy the image can be downloaded under CC By-Sa license. Here's optimized for use in desktop backgrounds and homescreen phones.

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 almost all tablets)
HTC, Samsung Galaxy & iPhone: 1080x1920 (compatible with many smartphones)

EXIF Metadata:
Camera: Canon EOS 40D | Lens: EF70-200mm f/4L USM | Taken: May 10, 2008
Settings: Aperture: f/7.1 | Exposure time: 1/500 | Focal Length: 200.0 mm | ISO / Flash: 400 / NO

Photographer: Stefan Ledwina from St. Pölten, Austria
License: Creative Commons Attribution-ShareAlike 2.0 Generic.
Dear visitors, if you upload the image elsewhere, you must mention the photographer and the source.
Thank you!