Coral reefs around the world aren't doing very well.... too much polluted water and disease causing "bleaching." There are some great video clips in this section on cnidarians, jellyfish, and annelids.
Did you know that a type of starfish can wipe out a whole coral reef? Did you know that some molluscs do NOT have shells? Check out the videos on squids and octopi -- watch a squid EAT its dinner! -- take a closer look at the suckers on the arms of an octopus.
Porifera are sponges -- the first animals to use cilia to pump water through their bodies and by doing so, capture plankton. Four of the videos in this section are on sponges. One deals with the ocean food pyramid, one is on plankton and one is on copepods & sharks.