When blow fish first grow up they live in plankton. When they are old enough, they leave. When they grow up, they grow spikes and they get much bigger. They have sharp teeth that are fused together to crunch up crab skeletons. Another cool thing is that they blow into the sand to find food. If a predator tries to eat a blow fish, their defense is blowing up so the predator can’t eat them. But the sad thing is that if the blow fish gets stuck in the predator’s mouth, both fish end up dying. Blow fish have stretchy, expandable skin like a balloon, so when they gulp water, the volume of their body grows bigger. Most blow fish have a toxic substance that makes them bad tasting and potentially deadly to other fish and deadly to humans. Have you ever seen a blow fish? If you have, do you think they are cool?