The crab spider on our Sunflower has grown pretty big and fat. The diet of bees apparently suits it well (I have seen it to eat another unfortunate bee).
I think this picture shows how the spider manages to subdue much bigger prey without falling off the plant with it during the struggle, although I have not had the luck to see it in “action”. You can see that the spider has built a small web and has thus essentially tethered itself with spider silk to the plant. Ingenious.