Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more . CNN  —  Two well-preserved ice age “puppies” found in Northern Siberia may not be dogs at all, according to new research. Still covered in fur and naturally preserved in ice for thousands of years, the “Tumat Puppies,” as they are known, contain hints of a last meal in their stomachs, including meat from a woolly rhinoceros and feathers from a small