What is the difference between a fox and a vixen?

What are the characteristics of oxygen? What did the plains Indians drink? Who invented the breed of German Shepherd? What is the treatment for a dog with collapsed lung? Iam getting a white poodle soon and you need a name for her please help you? In real life are the dolphins trained to detect underwater mines? How long do lions care for their offspring? Is it bad if your dog refuses to eat real food but instead eats dirt? How do shrew moles take care of their young? What is the average lifespan of seagull? Do elephant's mark their territory? What threatens a wild dog? What are some websites like pandanda? What are small kangaroos called? Do Badgers Eat Opossums? How far can a white tailed deer leap? Does so ya milk come from sheep? Does a black bear eat a raccoon? What part of great Britain did the cocker spaniel originate in? Mammals have this and other vertebrates do not?