This is exceptional?
I have an umbrella cockatoo that uses parts of his toys as levers, and the chains from his toys to build pulley systems. A "rake" is a pretty common and normal activity (at least with the 3 large birds I have). The one in particular is so effective with his tools that I recently (a year ago) had to replace his cage due to popped screws, broken welds, and bent bars, and we're talking 5mm steel bird cages.... I had to bump him up to one of the only 6mm cages I could find, and that, really, is only delaying him.