In what substance do mosquitoes lay their eggs?

Mosquitoes typically lay their eggs in or near standing water, such as ponds, marshes, swamps, or even stagnant containers like buckets and birdbaths. The eggs are often deposited on the water's surface or on vegetation close to the water, allowing the larvae to hatch and develop in the aquatic environment. Some species can also lay eggs in moist soil that will hatch when flooded.