Fresh Ivy Leaves Being Stored in Disused Nest Box

Fresh Ivy Leaves Being Stored in Disused Nest Box

Observation - Fresh Ivy Leaves Being Stored in Disused Nest Box. Description: Over the past few days I've noticed an increasing number of fresh picked ivy leaves being placed on an old robin's nest in one of our nest boxes. Can anyone help identify the creature responsible (probably a rodent)?

Over the past few days I've noticed an increasing number of fresh picked ivy leaves being placed on an old robin's nest in one of our nest boxes.
Can anyone help identify the creature responsible (probably a rodent)?