A sponge might not look like much, but these simple animals with no brain or ability to move have lived on Earth for hundreds of millions of years. They can hunt prey and spawn, and Jonathan demonstrates how in this fascinating segment about the biology of sponges!
The cool stuff you saw in the picture starts at 5:55. The divers spray a liquid into the water and then videotape the sponge sucking the water in, filtering it and then shooting it back into the ocean. Truly amazing creatures that this world couldn’t survive without.