Yes, then clean the box.
The eggs can fall from the nest, the eggs can be eaten or crushed by something, but the means really depend on the circumstances.
Eastern bluebirds typically lay eggs that are a pale blue color, although some may occasionally be white. The eggs are smooth and glossy, usually measuring about 0.9 inches in diameter. These distinctive blue eggs are a characteristic feature of their nesting behavior.
Yes, both bluebirds and sparrows are cavity nesters. This means they both use birdhouses to make nests in. Sparrows are very fierce and often when fighting with bluebirds they kill its babies or break their eggs.
Usually right around 2 weeks.
Watch the bluebirds closely to make sure that they incubate them. Also watch out for sparrows and other birds that may crack bluebird eggs or take over the nest.
They la 4-6 eggs per nest.
Sakura
There are several species of birds other than robins that lay blue eggs. Bluebirds lay blue eggs, as well as starlings and house finches.
you decide
theres no bird on them
The eggs are not any good if found underwater.
a dove is the bird that lays pale blue eggs.