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Describe the physical difference between the mountain juncos and the USCD juncos

User Bellackn
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A UCSD Junco is slightly fatter while the Mountain Junco is slimmer. A UCSD Junco has a somewhat lighter shade of black on it's head than a Mountain Junco. A Mountain Junco has a longer tail than a shorter tail like the UCSD Junco.
User Zsljulius
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