I was talking to a kitchen hand in New Zealand in an area with Kea. He described the escalating battle to keep kea out the rubbish bins. It started with a rock on the lid which they solved fast, and then various other hinderances to keep them out.

The kea sit and watch and learn over s day or 3 and then they are back in, causing chaos.

The kitchen staff were trying to solve each puzzle with time pressure, a job to do and bad weather. The kea looked to find it funny whole the poor worker was frustrated.