1. Koko the gorilla responds to a sad moment in her favorite film.
LINK: Watch the video here.
2. The parrot with the moving last words.
Alex the African gray parrot was able to count and identify colors, and he had a beautiful relationship with his person, Irene Pepperberg. When Alex died in 2007, his last words to her were "You be good. I love you."
3. The fact that cows have best friends and get stressed when they are separated.
According to scientist Krista McLennan, "When heifers have their preferred partner with them, their stress levels in terms of their heart rates are reduced compared with if they were with a random individual."
/ via: peta.org
4. The two guide dogs who led their owners down 70 floors in the World Trade Center before the towers collapsed on September 11.