Sea anemones are not colonial animals, but it is not unusual to find large numbers of the same species living closely together. This generally occurs because the organisms often reproduce asexually by lateral fission, small clones emerging from the side of a parent anemone and settling nearby. Interestingly, these clones may actively vie for a plot to settle upon in crowded environments and may kill other anemones, including those of their own species. Extremely competitive, anemone opponents inflate and slap one another with acrorhagi, fighting tentacle-like structures that feature stinging nematocysts. Such confrontations may continue to the death of one of the participants or until both anemones decide to retreat.