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The phenomenon was one in which tits (the birds, I mean), pecked through the foil caps on milk-bottles placed out side doors in the morning. Later studies showed that this was not a cultural learning/critical mass phenomenon, but one in which tits, both attracted to shiny things and natural peckers of things, mostly learned this independently, or at best, from watching the first in the neighbourhood to do so.

Another urban myth, I'm afraid, though I haven't looked it up so am not in a position to quote sources that will back up my position.

Any others here know about this?

cheer

the sunshine "brutally against the apotheosis of natural phenomena" warrior