Question

Why is it that duck-billed platypus is classified as a mammal ​

Answer 1

The answer above is better but also because it doesn’t lay eggs hope this helps too

Answer 2

The platypus is classed as a mammal because it has fur and feeds its young with milk. It flaps a beaver-like tail. But it also has bird and reptile features — a duck-like bill and webbed feet, and lives mostly underwater. Males have venom-filled spurs on their heels.