Watch sponges breathe out neon green water like they're smoking

There's something completely fascinating in something so incredibly simple. Sponges—animals that can't walk or swim—are incredibly efficient at what they do and have a super fun history to them too. Watch Jonathan Bird explain how sponges work and where they come from in this Blue World clip.

To illustrate how sponges work in filtering water, the neon dye was added at the base of the sponge. The sponge sucks in that water almost immediately with a sweet smoking effect.