This is due to the fact they they hold territories all year round and they sing to protect these territories.
Both males and females hold a territory and both sing throughout the winter.
The term 'Robin' is also applied to other (unrelated) birds with red or orange breasts, including the American Robin (a much larger thrush like bird) and the Australian Robin (which is much more closely related to the Crows). It is the red colour that triggers territorial behaviour and robins will even attack a tuft of red feathers on its own. During the 15th century it became popular to give human names to familiar species and hence the origin of Robin Redbreast, which was eventually shortened to Robin. Adult robins weigh less than an ounce (about 20 grams) and are approx. Much folklore is associated with our robin and how it acquired its redbreast.
The familiar tune about "The red, red robin goes bob, bob, bobbin' along" in fact refers to the American robin and not "our" robin. It is said that the robin helped Christ on the cross by removing the thorns from his head and that his blood splashed onto the robins breast.
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wild boars, as they dug up the soil in search of food.
The robin has now learned to follow humans in a similar way.
Severe winters (like the one just gone) can also cause a drop in population.
In fact, robins are very anti-social birds and if another robin strays into a territory, a fight may erupt which often results in serious injury, even death.
They will even chase other species, like dunnocks, out of their territory. Valentine's Day is day in which birds pick their mates, and in the case of the robin, its said that it's the female who chooses the male!
It may seem silly to build a new nest rather than use the previous one but there is good reason for doing so.
The old nest will more than likely be infested with parasites and by building a new nest, this reduces the spread of these ticks and lice. Less than one third of fledglings and less than one half of adults survive to the following year, but overall robin numbers are healthy and in fact are increasing.
However, once the young birds get over the first year, the chances of survival increase.