All three species of bluebirds – eastern, mountain and western – lay blue eggs. The blue eggs may have white streaks that resemble scratches, which may stem from urine or fecal stains, or when the female turns the eggs.
Eastern bluebirds lay eggs that are powder blue with no dark spots. The eggs have a smooth surface with a subelliptical shape. The mountain bluebird lays eggs that are bluish-white or pale blue, and the eggs are glossy and unmarked. The western bluebird also lays eggs that are light blue or bluish-white. The cell walls along the female's oviduct add coloring to the eggs, but this does not occur with white eggs. White eggs may also have a pink or blue tinge. A small percentage of bluebirds lay white eggs.Learn More
The eastern bluebird lays the smallest blue egg – approximately 4/5 of an inch – of all the songbirds that lay blue eggs. The eggs of western and mountain bluebirds are slightly larger than the eastern bluebirds, but smaller than the eggs of robins, blue jays, starlings, thrushes and catbirds.Full Answer >
According to Sialis, Eastern bluebirds and robins both commonly have blue eggs. Robin eggs are larger, often quarter-sized and paler blue, while Eastern bluebird eggs are deeper blue and smaller in size, closer to the diameter of a dime. However, many birds have variety in egg coloration and occasionally lay blue eggs.Full Answer >
Several kinds of wild birds lay white eggs. They include the ostrich, the ruby-throated hummingbird, the white-tailed hawk, Harris' hawk and the kingfisher. Interestingly, two of the birds that lay white eggs are the largest on the planet, the ostrich, and one of the smallest, the ruby-throated hummingbird.Full Answer >
Blue Jay eggs are blue or light brown with brown speckles. These eggs measure 1 to 1.3 inches in length and have an incubation period of about 18 days.Full Answer >