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 shelduck rabbit burrows, tree holes, haystacks or similar. In winter it is common on suitable estuaries and tidal mudflats as well. This bird is one of the species to which the "Agreement on the Conservation of African-Eurasian Migratory Waterbirds" (AEWA) applies. The young will dive under water to avoid predators and the adults will fly away from them to act as a decoy. Common shelduck The common shelduck ("Tadorna tadorna") is a waterfowl species of the shelduck genus, "Tadorna". It is widespread and common in Eurasia, mainly breeding in temperate and wintering in subtropical regions; in winter, it can also be