Bottles with tops are so rare now not all birds know how to peck their way in to them.
Robins are quite solo and have not seen it done. Blue tits are very social and have, well I suppose, a collective memory of how to do it.
Things from teaching:
Miss when you were at school did you pretend your phone was your calculator?
I left school in 1983. They didn't exist. Phones, calculators definitely existed.
Miss how many GCSEs do you have? None. They didn't exist.
And telling them school dinners did not have a choice at primary and at secondary you only had a choice of two things. And half the time the choice wasn't much of one, you could have chicken pie or chicken supreme which was basically the pie without the pastry.
They are astounded.
They are also so empathic to others. There is a vid on YouTube that shows just news clips from the USA about the HIV / AIDS epidemic and they are gobsmacked at things that happened, the police wearing rubber washing up gloves, a child banned from attending school.
If you have teens try it.