Who are these adorable little birdies?

This flock comes around every late spring/summer. They are just adorable! One of them flies around my bedroom window darting from branch to the window, to a branch, to another branch, back to the window etc... my cat goes crazy!

[@MarkAndShelleyHike]

We think they're Bush Tits: www.allaboutbirds.org/guide/Bushtit/id
They travel in flocks, make little cheeping noises, and are very cute. We love them! --Shelley