FBW hasn't come through on this one, so figured I'd give y'all a whack at it. Monteverde Cloud Forest Reserve, Costa Rica, 1500 m. I suspect it is some flavor of Green-crowned Brilliant, Heliodoxa jacula (esp as it seems to have the violet throat dot; and the structure looks right), but the rufous feathers are in completely the wrong place for an immature male, at least as described in Garrigues & Dean -- ear coverts & breast collar/belly ground color, rather than chin & malar stripe like a well-behaved definitive immature male. Other sp commonly found here: Purple-throated Mountain Gem Coppery-headed Emerald Stripe-tailed Hummingbird Green Hermit Violet Sabrewing Green Violet-ear Less common: Magenta-throated Woodstar Cinnamon Hummingbird Steely-vented Hummingbird
A monograph of the Trochilid, or family of humming-birds /.London :Printed by Taylor and Francis ;1861 [i.e. 1849-1861].biodiversitylibrary.org/page/34842975
A monograph of the Trochilid, or family of humming-birds /.London :Printed by Taylor and Francis ;1861 [i.e. 1849-1861].biodiversitylibrary.org/page/34842983
A monograph of the Trochilid, or family of humming-birds /.London :Printed by Taylor and Francis ;1861 [i.e. 1849-1861].biodiversitylibrary.org/page/34842991