Linda just watched Bruce Banner transform into the Hulk. Bruce is nothing compared to Trichobatrachus robustus. This hairy frog breaks its own bones to produce claws that puncture their way out of the frogs toe pads when it is threatened. I bet that is here Marvel Comics got the idea for Wolverine. There is a bunch of scientific gobbledgook if you want to read about the frog newscientist.com. Next time I see a frog on one of my walks, I am running in the other direction.