awww so cute!! I miss hatching little buttons!
I think the dark one is like a tuxedo, he has a little white bib. The other two I'm sure are silver and silver red breasted. No wild types. The wild types are dark and yellow striped as far as i remember.
The one on the far left looks like a silver, the other lighter one could be a silver red-breasted, and the little black one... no idea :) Never seen o0ne so black before.
They do have more heat than just a water bottle right? They should have a heat lamp to provide constant radiant heat :)