The male Robin is unmissable with his red breast, but he is very aggressive with other male Robins if they enter what he considers his territory, which he will defend sometime to the death. Urban Robins have become fairly tame but countryside Robins are very cautious of people. In March the female Robin, which is very similar to the male, will build the nest on her own. Urban Robins will nest in almost anything from pots to a crevice in a wall. The countryside Robins like to build their nests hidden and well protected in thick ivy or dense bushes and trees. She lays 4 to 6 eggs and incubates them on her own. The chicks hatch after 12 to 14 days and are fed by both adults. The eggs are blue, also called eggshell blue, which is a shade of cyan (greenish-blue colour). They fledge around 14 days later. The male will continue to feed the chicks on his own if there is a second brood.