Kayne uses Lilith to send mail. He acquired her from his mother.
Abigail wanted to get into contact with Kayne but was nervous about seeing him. She purchased the cheapest owl she could and sent him a letter. They used this owl for correspondence for some time before Abigail decided to abandon Kayne once again. In the process, the owl was left with Kayne as she either could not find Abigail or did not want to. Lauren Grady soon decided that the owl needed a name and she chose Lilith.
Despite Kayne's general dislike of animals and annoyances at her bad attitude and ineptitude, he bonded with Lilith over time and she has since stayed with him and her family.