Jawless Fish

Jawless fish are some of the strangest creatures in the water. Instead of jaws, they have round, sucker-like mouths that help them latch onto food.

Their bodies are long and eel-like, with skeletons made of cartilage, similar to the material in your ears and nose.

This makes them lightweight and helps them glide smoothly through the water.

Unlike most fish, they don’t have a true backbone. Instead, they have a notochord that supports their body throughout life.

Since they lack jaws, they use suction and a rough, tooth-covered tongue to grab and eat food.

They have a tiny, light-sensing organ called the pineal eye on top of their heads. It’s not like a regular eye—it doesn’t see images, but it helps them know when it’s light or dark.

They breathe through at least seven pairs of gill pouches, which can take up oxygen from the water.

Jawless fish have a two-chambered heart, unlike your 4-chambered heart.

Interestingly, they are ectothermic, which means their body temperature depends on the temperature of the water around them.