Waters off Washington state only second place in world where glass sponge reefs found

The same species of glass sponge in this 2005 photo from British Columbia waters is one of a trio of reef-building sponges that have been discovered on the seafloor 30 miles west of Grays Harbor. The sponges, the tallest of which are 1 1/2 feet tall, have grown on mounds of skeletons of previous generations of glass sponges. The image depicts only a tiny part of a reef in Canadian waters that stretches miles in length. Credit: University of Victoria