In southern and warmer states, the incubation period is shorter than in colder northern states.No, only the female incubates the eggs. Scientists are always searching for better more precise answers to natures mysteries. Bluebird: Neat, cup shaped, woven nest of 100% fine grass or pine needles. It simply makes a predator egg thief’s job more difficult and the eggs chances of survival greater.An interesting study out of The University Oxford by Andrew Gosler, Oliver R. Connor, and Richard Bonser suggest speckles and spots are there for a totally different/additional reason.In fact, they suggest the main reason for blotches actually serve a non-visual function. One egg takes about 24 hours from ovum to egg.It’s in the last few hours of production “color pigment” is added to the freshly formed calcium carbonate shell. Therefore, it’s unlikely the egg or eggshell will fall on the ground to be discovered. Bluebirds are cavity nesters. The female lays one egg every day.On rare occasions, two females may lay eggs in the same nest. Especially, in the thinner parts of the shell.Previously, spots/speckles on blue eggshells and others were thought to be appearance related, visual cues for identification. The young inside the eggs in the front and the lower right are both pipping. Not to mention the Jackson Pollock-like Lastly, consider how new the study of bird eggs is as it relates to pigmentation. Birds, Bird-Feeding, Bird-Identification, Bird-watchingOne of the most commonly asked questions among folks that keep nesting boxes is what to do with Bluebird eggs presumably left in the nesting box.This question also applies to nest occupied by other birds or nests built somewhere else.This article goes through some basic and necessary information about the eggs and nest of Bluebird, so you are informed about making decisions.Bluebirds are obligate cavity nesters, which means that they only build nests inside a cavity, a chamber, or a structure that resembles a sheltered chamber.Cavity-nester: A bird that exclusively or nearly exclusively nests in natural or artificial cavities.A cavity is defined as a chamber with an entrance that shelters the nest, eggs, and brood.Cavities can be natural, such as those excavated by woodpeckers, or artificial, such as nesting boxes.When nesting in natural cavities, Bluebirds use cavities excavated by woodpecker 77% of the time.A review of the literature shows reports indicating that bluebirds have built a cup-shaped nest on the ground and on thick branches.Allaire (1976) reported a nest on the ground on surface-mined lands in Kentucky. Image what we will know in the next ten year about this subject! The male does not participate in the incubation of the eggs.The male protects the territory and brings food to the female while she is incubating the eggs.The female takes breaks to feed and poop in the morning hours and throughout the day.During these breaks, both the male and female forage near the nest and keep an eye open for predators that may approach the nest.Because male and female Bluebirds have specific roles during the breeding season, the timing of losing one member of the pair may result in different outcomes.While any of these scenarios can result in nest abandonment, a likely scenario is that another bird replaces the missing member of the pair. While it’s not as important for cavity nesters like the Eastern Bluebird to camouflage their eggs from predators, it is important for open nesters and ground nesters.These birds rely on well-hidden well-camouflaged eggs. Light blue, pale blue.


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