Perhaps the most common bird with brown spots on its eggs is the house sparrow. These birds range throughout Europe, Asia and North and South America as well as parts of Australia and Africa. Their eggs are pale greenish-gray or cream with irregularly shaped, fine brown speckles throughout.
Although the house sparrow is the most numerous and widest-ranging bird with brown spots on its eggs, many other species also have similar egg coloration. Brown spots provide effective camouflage for birds who build exposed nests. Some examples of other birds with brown-spotted eggs are the nuthatch, the chickadee, the titmouse and the wren.