They occupy the typical role of a scavenger species. This is the only gull species that nests on Great Race Rocks, although several other gull species are present in large numbers through the winter months. Their coarse tentacles catch morsels of live and dead animals. The main difference in ecological niche being that in this anemone, symbiotic algae inhabit the tissues.
Certainly the purple urchin, Strongylocentrotus purpuratus is the one with the nearest similarities of ecological niche requirements. It does not however burrow into the stone as the pencil urchins do. Note that both species tend to use surrounding materials as sheltering tools. Subjects: Science and technology — Life Sciences.
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