Yesterday we watched bird brain of britain 1985, which I think I probably saw on TV back when I was a kid. It’s got birds solving these crazy selfbuilt puzzles, so of course we were inspired to set up our own test device, which so far has not been used.
In fact all the birds are staying away, maybe they think it’s a trap! It does look a bit like a rocket. Updates to follow, hopefully the blue tits will crack it in a matter of weeks!