Our 6-month old barn kitten, Nilla, does just that. She'll eat what she wants and leaves the rest to show us OR she'll take it with her into her soft-igloo-house. She loves to save her treasures of the hunt. I think she just savors the memory. Ick
Usually we find the shriveled, petrified remains and dispose of it before she notices.
<>< Sorrow Looks Back. Worry Looks Around. Faith Looks Up! -- "When they try to tell you these are your Golden years, don't believe 'em.... It's rust."