This video from the USA says about itself:
9 October 2016
Bold and brilliant male American Goldfinch in prime summer colors which are now fading fast as winter approaches. Easy to film around feeders they are much more difficult to catch in pensive relaxing moments like this. They tend to spend time in heavy cover when not feeding.
The American goldfinch (Spinus tristis), also known as the eastern goldfinch or “lightning bird,” is a small North American bird in the finch family. It is migratory, ranging from mid-Alberta to North Carolina during the breeding season, and from just south of the Canada–United States border to Mexico during the winter.
The only finch in its subfamily to undergo a complete molt, the American goldfinch displays sexual dimorphism in its coloration; the male is a vibrant yellow in the summer and an olive color during the winter, while the female is a dull yellow-brown shade which brightens only slightly during the summer. The male displays brightly colored plumage during the breeding season to attract a mate.