Chimpanzee bottle feeds tiger cubs

The Feed compiles some of the week's best viral videos, including a monkey hitting a dog with a lollipop, astronaut Chris Hadfield's good-bye tribute to the International Space Station and the Gregory Brothers' celebration of YouTube's eighth birthday. Plus, an adorable 2-year-old sings Pearl Jam with incredible accuracy.

Stunning time lapse video exhibits the relationship between Montreal, its residents and winter. Video courtesy of Stephane Hoareau Timecode Lab.

An orphaned piglet on a Romanian farm was adopted by a mother cat with very maternal instincts when they were put together in the same atelier by their owners.

Check out the mysterious sliding stones of Racetrack Playa, some insane star trails, and pink aurora in this time lapse video of Death Valley. Video courtesy of Sunchaser Pictures.

The Feed compiles some of the week's best viral videos, including the best dance moves you'll ever seen on a treadmill, a seven-and-a-half-month-old learning to water ski, and cat who hates Lego Town. Plus, Ohio hero Charles Ramsey get remixed into a catchy and hilarious song.

The Feed compiles the Internet's best marriage proposal videos, including a live lip-dub from the back of a Honda, a flashmob at Downtown Disney and a man who turns memes into matrimony. Plus, a movie trailer for a truly limited "engagement."