**Guest Post by Matthew**
Today we Skyped Mikki, who studies sharks.
We learned that:
- Some sharks have to swim to live. This makes the water flow through their gills so that they can get oxygen.
- Some sharks glow in the dark!
- Some sharks lay on the bottom of the sea until their prey (small fish) comes by, and then they attack.
- There is a goblin shark, whose jaw can come forward out of its socket.