👉 Mosasauroidea is a family of dinosaurian birds, which includes the famous "mosasauroid" or "mossy-rumped" bird. These dinosaurs lived around 65-73 million years ago in what is now known as North America and Europe. They were small but incredibly fast birds with wings that could extend up to 4 feet long. Their feathers were often blue or green, which helped them fly at high speeds. The exact age of the mosas