Here are some reasons why:
* Predation: Nesting on the ground leaves eggs vulnerable to predators like foxes, raccoons, and snakes.
* Incubation: Muscovy ducks often build elaborate nests with a large amount of nesting material, which helps to insulate the eggs and keep them warm during incubation.
* Secrecy: Muscovy ducks are naturally secretive birds, and nesting in hidden locations helps to protect their eggs and ducklings.
While it's possible for a Muscovy duck to lay eggs on the ground in rare circumstances, it's not their preferred choice.
If you're concerned about your Muscovy duck's nesting habits, you can provide her with a suitable nesting box or other elevated, secluded nesting site. This will help to ensure her eggs are safe and that she has a successful nesting season.