Getting chicks to eat greens?

[rlephoto]

Hi our 6 chicks (3 Welsummers, 2 Easter Eggers and a Cinnamon Queen) are 5-6 weeks old. They seem to be doing fine, just built a a box for them 28"x48' and they love the added room. Been too cold to get them outside thus far. We have a coldframe full of lettuce greens. I bring them lettuce they ignore it. Am I rushing them along with greens or is there a trick to getting them to eat them?

Introduced them to our lonely adult hen yesterday, she just walked by their box and barely noticed them. She seemed more interested in exploring the outside than being in the basement.

I have a short video of the pullets on my facebook page see

https://www.facebook.com/video.php?v=151096121725005

Cheers,
Randy