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What is this insect which looks like a cocoon but is moving?

I am from Northern Italy, close to the border with Slovenia.

I saw this thing today on the window, and was sure it was a piece of a dry rosmarine branch carried there by the wind – until it started to move.

It looks like a cocoon of some kind, in fact there is on the top of it a head of something like a caterpillar which sometimes comes out together with some portion of its body with two (?) tiny legs on each of its body “segments”. But I imagined cocoons as something attached to a branch, not moving.. And this thing moved from one point of the window to another, always attached to the window (not using what I think are the caterpillar’s legs). (I must admit I am reluctant to open the window and examine it from a closer range 🙂 ; the photograph is taken from inside the house).

What can this insect be? (the length is around 4-5 cm)

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