Globally. key predators such as lobsters are thought to control urchins. In south-eastern Australia. the role of Sagmariasus verreauxi (eastern rock lobster) as a key predator of the native urchin Centrostephanus rodgersii (long-spined urchin) has been questioned while the sympatric Heliocidaris erythrogramma (short-spined urchin) may be eaten more frequently. https://countryscenesaddleryandpetsuppliers.shop/product-category/tripping-collar-2/