The Ruby-crowned Kinglet is a small, forest songbird known for its energetic and complex song. This songbird forages for food in trees and shrubs eating insects and berries. It is easily identified by its habit of constantly flicking its wings. This kinglet has green upperparts, pale yellow underparts, and a distinctive white eye ring. It is a common migrant through early winter as it heads farther south. This Ruby-crowned Kinglet was recently observed during a walk in the wooded trails around Long Pond in Falmouth.
Overview of Ruby-crowned Kinglet: http://www.allaboutbirds.org/guide/ruby-crowned_kinglet/id
More about the Ruby-crowned Kinglet’s might song: http://birdnote.org/show/ruby-crowned-kinglet-tunes