Heavily-streaked hummingbird with an amazing hooklike bill. It ranges in humid foothill forest along the east slope of the Andes, where it overlaps widely with the similar White-tipped Sicklebill. Both species have white tips to the tail, but note Buff-tailed’s buffy edges on the tail feathers and glittering blue or green patches on the sides of the neck. Feeds primarily on “lobster claw” Heliconia flowers and is rarely encountered away from them. Song is an extended, rollicking series of soft chirps given from a concealed perch. Not known to visit feeders.