- Brackish – slightly salty as in a mix of river water and seawater.
- Bladder – anything inflated and hollow.
- Deflate – let air or gas out.
- Crustaceans– small animals with shells.
- Vertebrate – an animal distinguished by the possession of a backbone.
- There are 120 species of Puffer fish around the world. 30 live in freshwater, the rest live in salt or brackish water.
- Puffer fish puff up when they get scared, by inflating their bladder.
- Some puffer fish are poisonous.
- Puffer fish are a more recent resident to Long Island Sound, most likely because our waters have gotten warmer.