No, platypuses do not change their fur color. The fur color of a platypus remains consistent throughout their lives.
Platypuses have a unique appearance with dense, waterproof fur that helps them stay warm and dry while spending much of their time in water. Adult platypuses have a dark brown or blackish-brown fur on their back and sides, while their underbelly is lighter in color, often cream or pale yellow. This fur coloration helps them blend in with their environment, providing camouflage and protection from predators.