Those pups are super cute! It would be cuter if there were some chocolates too. I'm slightly biased...
Two black labs, a few chocolates do they very rarely make.
It's a wonder they had 3/7th yellows really.
Yeah I was curious how that all worked and read about the genetics that go into the fur coloring. You I imagine know some of this stuff, but for anyone else that thinks its interesting...
http://en.wikipedia.org/wiki/Labrador_Retriever_coat_colour_genetics
It's possible to get all three colors from uniform colored parents depending on what genes they carry.