Oak

That was a tricky one. The tree next to my window is obviously – a short look at the leaves and the flowers reveals that – a lime tree. As I learned on this way, the american word for lime tree is linden, which is closer to the Germanic origin of the name and does prevent some confusion with other things named lime. It is also an interesting trivia fact to know that the Croatian currency does have limes. Anyhow, the noisemaking nuts are definitely not originating from a lime. My hypothesis from yesterday was validated today: Acorns, definitely. But how do they get there?

Those are acorns.