I took my kids to the pet store today to replenish pet supplies. When I was ready to check out, the kids went over to a huge salt water tank. They peered into the glass and oohed and ahhhed over the aquatic creatures.
Then they saw something strange. "Mama," my daughter said. "Come here and check this out."
"Hold on a minute. Let me finish paying."
When I was done, I walked over to the tank. "What do you want to show me?"
"That sea urchin has an eyeball."
Huh? "I don't think sea urchins have eyeballs."
My son pointed to the creature. "Yeah they do. Look."
Sure enough, there was some kind of round eyeball thing on it. And it looked like it was looking at me. That was a little freaky, but I still didn't think that sea urchins had eyeballs. So I asked the worker. "What's that bubble thing on the sea urchin?"
"Seriously? Sea urchins have eyeballs?"
The guy nodded. "It's used to see and excrete waste materials."
Okay. That was way more than I needed to know. What a freaky creature!
Did you know that sea urchins had eyeballs (that excrete waste material, too)?