Found!
https://youtu.be/2-JBNqnybB4
At minute 6.
The first mouse is captured by the female and stolen / eaten by the male.
The second mouse (? but the reconstruction is very doubtful) is killed by the male and left dead over a stone for the female: but this fact is only said by the telling voice. Nothing to see actually from the footage to confirm the "gift" theory...