Charming

The collective noun for a group of Goldfinches is a 'charm'. It so suits them.
"Sometimes goldfinches one by one will drop From low hung branches; little space they stop; But sip, and twitter, and their feathers sleek; Then off at once, as in a wanton freak: Or perhaps, to show their black, and golden wings Pausing upon their yellow flutterings."
John Keats