From the ear of that deer, mozu (a shrike) came out and, based on this, the place was named as mozu mimi hara (shrike ear field) (in addition, mozu is the bird of Osaka Prefecture).
その鹿の耳の中からモズが現れたことから地名を「百舌鳥耳原」と名づけられる（なお、モズは大阪府の鳥である）。