report about a Polly-Keet.

Polly-keet: Polly-Keets are little in-scents. They are often called a sea worm ,they have a jaw and a mouth and legs and a tentecals that senses things that are near them. Most species have been found in the ocean, but they exist in estuaries, lakes, and rivers too. They are incredibly diverse and often comprise over 50% of the animal species found in any sea bottom sample.  It's not unusual to find more than 20 000 polychaetes living in a square metre of sand. 

They contribute a huge amount of food to important seafood species like flatfish, skates, really just about any demersal or benthic larval fish (fish living on or near the seabed). All that is only a tiny fraction of their job recycling nutrients between the sea floor and the water column.  They constantly rework the sea bottom and stabilise sediments with their tubes. Some worms tubes are dense enough to form reefs which can shelter many other animals and even offer protection from hurricanes.