BT Meil 20b(20) :דמסו̇ב̇ר ואכל ציפרא פרח ליביה כי ציפרא‏ : the heart of one who lets blood and eats (the meat of ) a bird will palpitate like (the fluttering of ) a bird
See the entire entry for ṣeppar, ṣeppɘrā n.f./m. bird