Are they nuts???

See the window in the right, in the picture below??

We cannot even figure out how to get up there to scrape off the stickers, but one of the cats figured out how to get there!

These are scratches below the window ledge! That means one of the felines jumped and did not make it, or it jumped, struggled and then made it. I have checked them all for broken bones, and so far everyone is well! Insane!