The woman, Margi Heath, 57, of Upper Farringdon said she kept the leveret warm that way, feeding it baby formula with a syringe, The Daily Telegraph reported Sunday.
"She stayed indoors with me," Heath said. "I put her in my bra to keep her warm, else she would have died. I slept with her and every time she was hungry she popped her head up."
The hare, named Miracle, is now a tame 3-month-old rabbit, the newspaper said. She was found alive inside the womb of a pregnant hare killed by a dog.
"She's quite tame now," Heath said. "She has a lead we use to walk her with, and lets people stroke her, though she can tell if someone is a stranger."
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