Ruby-Crowned Kinglet

It is one of North America's smallest birds. It can be easily recognized by the buffy olive colour, and plain face with a white eye-ring. The males occasional display a red crest which distinguishes them from the females. But the easiest way to identify them is by their song - which starts with two or three high “tsees” followed by five or so lower notes that sound like “cup a tea”, “cup a tea”....