Three’s a crowd – Goniobranchus tasmani…

Three's a crowd - Goniobranchus tasmaniensis nudibranchs on their feed sponge #marineexplorer

Three’s a crowd – Goniobranchus tasmaniensis nudibranchs on their feed sponge #marineexplorer by John Turnbull

Via Flickr:

G. tasmaniensis is most often found on its pink feed sponge. That might be ok when the animals are small, but once they grow big enough to mate it seems things can get a bit crowded! Bare Island