Mother-chin gave birth to Baby-chin on Saturday. We noticed a red mark on Baby-chin's ear on day 2. We saw dried blood on it on day 5. On day 6, the ear looks mangled. Baby-chin is in the same cage as Mother-chin and Father-chin. Is one of them the cause of this? Mother-chin has given birth twice before. There may have been missing patches of fur in the past, but never wounds. Baby-chin's behavior has been normal throughout this.
I couldn't really get a good picture, but one can be seen below.
http://img.photobucket.com/albums/v253/windwhisperbomb/DSCF1421.jpg