Dunnock system can be shifted from one that favours female success (polyandry), to one that promotes male success (monogamy, polygynandry, or polygyny). The dunnock builds a neat nest (predominantly from twigs and moss and lined with soft materials such as wool or feathers), low in a bush or conifer, where adults typically lay three to five unspotted blue eggs. Broods, depending on the population, can be raised by a lone female, multiple females with the part-time help of a male, multiple females with full-time help by a male, or by multiple females and multiple males. In pairs, the male and the
Common sandpiper but is a vulnerable species in some states of Australia. Common sandpiper The common sandpiper ("Actitis hypoleucos") is a small Palearctic wader. This bird and its American sister species, the spotted sandpiper ("A. macularia"), make up the genus "Actitis". They are parapatric and replace each other geographically; stray birds of either species may settle down with breeders of the other and hybridize. Hybridization has also been reported between the common sandpiper and the green sandpiper, a basal species of the closely related shank genus "Tringa". The common sandpiper was one of the many bird species originally described by Linnaeus in