The "Download Now" link directs you to the iTunes App Store, where you must continue the download process. You must have iTunes installed in order to open the link, and you must have an active iTunes account to download the application. This download may not be available in some countries.
From Canalino Software:
Only the Best HD Animals Wallpapers for your iPhoneMake it unique and beautiful your iPhone with these wonderful backgrounds carefully selectedAll wallpapers are in HD resolution at 640x960 +perfect for each device.iPhone - All generationsiPod - Touch All generationsMORE THAN 100 HD Animals WallpapersALL TO SEE OFFLINE (not require internet connection) so you can change the background every time you want even if you do not have internet on your iPhoneONLY THE BEST QUALITYYou can try before you set it as shown in "LOCK SCREEN" or the "Home Screen". Can e-mail to a friend