What could be harvesting my green strawberries?

Hello,

It has become apparent to us that something very agile is harvesting our strawberries that are in a half meter high hugel bed. They're harvesting all of them,  but they make little piles of the green ones and leave them there. There are no obvious signs on them on what could have done it. So it is not a bird.

Fortunately for us, we also have strawberries in one of the green houses that we get for ourselves.
But we're really curious about what animal could be doing this. Has anyone else had a similar experience?

We would never harm whatever it is that is doing this-- only set a live trap for it if it's something non-native. We live in Brittany, France.

Cordially

A neighbor's child ....