A giant parrot fish greets visitors at the main entrance to the National Zoo. A bit farther on are a tufted puffin seabird, a freedom starfish and more — all bright, beautiful and eye-catching sculptures.

But take a closer look, and you begin to notice they are assembled with plastic toys, a hair comb, bottle caps, beer cans and many other everyday objects.

I observed visitors coming in, thinking these sculptures are made out of recycled plastic. But, in fact, they are marine debris. And when they find out, they are shocked.

The sculptures were created by Angela Haseltine Pozzi — with the help of thousands of volunteers — to deliver a serious message. The artist is executive director of Washed Ashore, a non-profit environmental group.

This is all plastic picked up off of beaches, every single bit of it. So we have processed about 18 tons of garbage off of a small area of beach in the last six years. And it could be anywhere in the world.

This is a worldwide problem, the plastic pollution issue. So far, Pozzi has created 68 such sculptures, and 17 of them are displayed throughout the National Zoo.

This whale bone ribcage is made entirely with bleach bottles; the blue marlin has flip-flops inside its mouth; and hundreds of water bottles create the jellyfish.

I've purposely chosen to represent the animals that are threatened by marine debris. The fact that plastic breaks down into microscopic pieces and is getting into the entire food chain means that everything in the ocean is affected by it.

A recent study estimates about eight million tons of plastic waste enters the oceans each year, and poses a threat to a wide variety of marine animals. Single-use plastics are probably the worst you can get.

They are used for five seconds and then last forever. We don't even think about it. The artwork seems to be making an impact on visitors of all ages. First we need to make sure that no trash is washed up.

So instead of leaving it onto the beach, you need to pick it up and you need to put in the trash before it gets washed out and gets fish. Or you can recycle it. We have to be more careful.

We have to be more attentive about what we do with the containers and things we use. Pozzi hopes her traveling exhibit will reach as many people as possible across the United States, and overseas as well.