Reddit reviews The Birds of Ecuador: Field Guide

well those two things are pretty much what I used 😅

I busted out this 750 page monstrosity, found a decent match, and then compared it to sightings on eBird for Pichincha Province, where Mindo is. Luckily Mindo (and Ecuador in general) is pretty well covered by eBird, and Buff-tailed Coronet is pretty common in the area.

I think this is the most recent single-volume book. There's a two book set as well, but that seems impractical

http://www.amazon.com/Birds-Peru-Princeton-Field-Guides/dp/069113023X/ref=sr_1_1?ie=UTF8&qid=1422107016&sr=8-1&keywords=Birds+of+Peru+%28Princeton+Field+Guides%29

http://www.amazon.com/Birds-Ecuador-Field-Guide/dp/0801487218/ref=sr_1_1?ie=UTF8&qid=1422107072&sr=8-1&keywords=birds+of+ecuador

http://www.amazon.com/Travellers-Wildlife-Ecuador-Galapagos-Islands/dp/1566565308/ref=sr_1_6?ie=UTF8&qid=1422107072&sr=8-6&keywords=birds+of+ecuador

http://www.amazon.com/Guide-Gal%C3%A1pagos-Islands-Isabel-Castro/dp/0713639164/ref=sr_1_34?ie=UTF8&qid=1422107144&sr=8-34&keywords=birds+of+ecuador

http://www.betterworldbooks.com/Guide-to-the-Birds-of-the-Galapagos-Islands-id-9780691012254.aspx

http://www.amazon.com/Field-Guide-Birds-Peru/dp/0934797188/ref=sr_1_35?ie=UTF8&qid=1422107144&sr=8-35&keywords=birds+of+ecuador