Sea lions and humans are the only two known mammals that can sync to a beat. 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. If there are no suitable male turkeys around, a female turkey will fertilize her own eggs. Goats and sheep have rectangular pupils, which give them a 360 degree view of their surroundings. 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. The Labrador Retriever has been the most popular dog breed in the U.S. for nearly 30 years.