@tsarstepan,
Oops, missed the crow. Yep, tsar. Crows are very very smart. Not surprised they've been found to use tools. I would be surprised if they're the only birds to do this.
Remembering back to the olden days when humans were considered the only toolmakers. In fact, it was how we were defined--until Jane Goodall observed chimps adapting twigs to use them as tools. Not just picking them up, but changing them to use them. Making tools.