These definitive answers to the mystery birds shown in today’s post come from my colleague Steve Pruett-Jones, who knows his birds. His answers (I’ve added the species names):
The yellowish bird [bird #1] is a Pine Warbler, Setophaga pinus. (I had originally thought it was a yellow warbler because in certain plumages these two species are similar).
The other bird [bird #2] is a Pine Siskin (Spinus pinus: what a great name!)