These are what we jokingly call the Pajama Sisters, two young Black Cochin hens. They're about the size of a softball, soft and fuzzy, friendly, and covered head to toe in thick feathers...which makes them look like they're in those footie pajamas.
This is the friendliest one, she'll sit on your lap and likes to be pet.
This one is the larger of the two, and is more aloof than her sibling, but still pretty friendly for a chicken.
And the two of them together hunting for bugs in the garden.