Cats recognise the voice of their owner, but never evolved to care.
22
Sergeant Stubby was the only war dog to be promoted to sergeant through combat in WWI. He saved his regiment from surprise mustard gas attacks, found and comforted the wounded, and even once caught a German spy by the seat of his pants, holding him there until American Soldiers found him.
16
The CIA once spent $20 million on a cat equipped with gear to spy on the Soviets, but it was hit by a taxi.
328
A dairy cow can produce more milk when listening to music.
446
A zoo in China gave a gay penguin couple the opportunity to raise a chick.
11