Bloodsong by Karen Marie Christa Minns

"She trembled. The bird was still. In a state of shock, its body had gone limp. Its eyes were dull, glazed, its beak slightly open, its breath infinitesimal. Instead of horror at her deed, she felt excited by the sight of the bird's comatose body. She reached for the cowering female, scooping it from the cage with her empty hand. A snarl more animal than human emanated from Ginny's throat..." (from book cover)

Paperback Info: ISBN 1887237089, Odd Girls Press, 1997