Perhaps a casted pellet (hork)?
Below is Sydney taking a break outside and searching the skies for Mel giving us a good view of her eggs (no pip seen) Today is day 30!
he arrived emptied taloned 8:57pm.
Mel left at 12:52am
He knew he needed to go hunting soon so he cut short snuggle time. He left 2:37am.
Mel returned with 1st treat - ROUS 4:53, handed to Sydney, bonded & left Syd placed the ROUS in the pantry. Mel returned with 2nd treat - RAT 5:58. He gave it to Syd. She was very thankful chittering to their eggs. She swallowed it 1 minute later. Mel left 5:59. Currently 1st treat is in the pantry.
While Syd was on flyabout 12:54 - 12:57 We heard peeps (see video).