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Esimerkit

• A recent study of shell-shape in the dog whelk Nucella lapillus along the Bristol Channel suggests - that in progressively less saline conditions the species lives in a colonising situation, where periodic food shortages, rather than physiological limitations, decimate populations and sometimes lead to local extinction.
• Evidently the dog whelks perceive the chemicals released by the crabs and their prey.[...]Dog whelks are believed to have evolved in the Pacific, and to have spread into the North Atlantic in the Pliocene, during a warm period when it was possible to pass along the coast of the Arctic Ocean.
• The dog-whelk is carnivorous; acorn barnacles and the mussel Mytilus edulis (p. 254) are the main prey species.