Elephants can't jump. Their leg bones all point in a downward direction, which doesn't allow for them to spring upward. One of Sir Isaac Newton's least-talked about contributions to society is the invention of the cat/dog door. You refer to a group of porcupines as "a prickle of porcupines." Genome analysis of current dog breeds revealed that the Basenji is the world's oldest breed, having existed alongside early humans on the African continent. About 3 percent of the ice in Antarctica is actually frozen penguin urine. The Beatles added dog whistle sounds to their song "A Day in the Life." Some fans have reported that their dogs "sing" when they hear it.