Anyone know what moss animal this is ? Starts with the letter B and is a regular summer visitor in my pond.We have had them as small as a nickel and as big as a car hood they feel like jello! If we leave out of the water the night time bandit [racoon] will eat it all up. Well do I have your attention now? It's a Bryozoa literally moss animal ,which like sponges ,filter water for their food. We were pleasantly suprised to find out they only grow where the water quailty is good.