One fabulous trick of this goofy fish is self-inflating when they feel threatened. By rapidly gulping water into their elastic stomachs, they can turn into a spikey ball, although it’s physically exhausting for them and it ruins their chance to escape. They can also bite with digit removing vigor so it’s best to admire them from a distance. I sketched them in both deflated and fully expanded modes after a snorkel trip in Hawaii. It’s wise to avoid eating them because they pack tetrodotoxin, a neurotoxin that’s about 1200 times more toxic to us than cyanide with no known antidote. They are however adorable, for spikey, poisonous, biters.