Dolphins in the wild use language and call each other by unique names. Wild Macaques in Japan are so smart that they search for coins to use in snack food vending machines. The dog with the loudest recorded bark is a German Shepherd named Charlie whose bark registered at 113.1 decibels. That's almost loud enough to cause hearing damage. Blue jays have learned to mimic the sound of screeching hawks as a way to scare away both predators and other birds. The Guiness World Record for smallest dog is held by a 3.8 inch tall Chihuahua named Milly. 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.
