Birdy was seen alot throughout Sabertooth Deathhunt series. She provided Sabertooth with his "glow" which kept his blood thirst to a minimum. After she was killed by Graydon Creed (Sabertooth's son), Sabertooth went on a rampage, and at one point revealed that he wasn't just using her for the glow...she was actually "kinda special" to him.
Birdy's Sabertooth Quote:
Sabertooth: I need that glow Birdy....I need ya to take the pain... -Sabertooth Deathhunt #1