Robin red bird (European Robin) 🐦: The robin’s red chest isn’t just for looks; males use it to defend their territory. Two males will often puff up and “face off” by showing their red breasts. Despite their cute appearance, robins can be very territorial and aggressive toward intruders, even other robins. Unlike many birds, robins sing throughout the year, even in winter. Their sweet song is one of the few heard during cold months. In the UK, robins are strongly associated with Christmas. They