What physical measurement defines the Willow Warbler's length as a small passerine?
Answer
It measures approximately 10 to 11 centimetres in length.
The Willow Warbler firmly belongs to the category of small passerines based on its standardized dimensions. Its length is consistently cited as measuring approximately 10 to 11 centimetres. This measurement, combined with its slender and graceful build, contributes to its overall assessment as a physically small bird. While size alone is acknowledged as often being unreliable for definitive field identification against very similar species, knowing this approximate length confirms its status within the smaller end of the avian spectrum.
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