Dalton

Dalton was a District 10 refugee that found his way to District 13 on foot several years before Katniss Everdeen arrived.

During his life in 10, he'd worked on one of the beef ranches, maintaining the genetic diversity of the herd with the implantation of long-frozen cow embryos.

He suggest to Katniss that District 13 needs all the refugees they can get because ever since a pox epidemic killed many of their own and left even more infertile they have needed a new genetic gene pool to draw from in order to have children and make their population more sustainable.