Cats and dogs can hear ultrasound.
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The elephant brain weighs about 6,000g.
274
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
There's a lizard known as the 'Jesus Lizard' that can run across water.
11
When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
20