"Not sure how this could happen, but two 100 g chocolate bars left on the interior windowsill in the morning were no longer there in the afternoon.
There wasn't anything left, not a trace of the bars or the packaging, nothing.
The window was left open for fresh air, however, there is a limiter in place which does not allow the window to open more than 2 inches.
Moreover, birds do not take food somewhere else. They eat it where they find it.
A word of caution: do not leave anything of any value in the room when you are not there."