How do I differentiate between a Rufous Hummingbird and Allen's Hummingbird?

Biology
Tutor: None Selected Time limit: 1 Day

What are the best ways to differentiate between these 2 species of Hummingbird? Is there an easy way to tell one from the other based on age, gender, location or season?

May 12th, 2015

the two species are differentiated by their characteristics which are blue throated and black chinned...................

May 12th, 2015

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May 12th, 2015
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May 12th, 2015
Dec 2nd, 2016
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