Westerm Emerald - Chlorostilbon melanorhynchus by Luis Alcivar Via Flickr: Among Ecuador's smallest hummingbirds. Roughly 2.5 inches (6.5 cms). The best birdwatching and wildlife photography tours in Ecuador: www.sanjorgeecolodges.com/ Photo taken at: San Jorge Eco-lodge Tandayapa - Hummingbird Sanctuary
Source: Flickr / bird_charmer