It has been found in the milk of water deer and reindeer. These include sika deer, red deer, musk deer, roe deer, and water deer. Water deer are capable of emitting several sounds. "Ralstonia" has been identified in the milk of water deer, reindeer and goats. In Korea, water deer are found nationwide. They live near water and are called "water deer" in Chinese. Mating among water deer is polygynous, with most females being mated inside the buck's territory. Chinese water deer were first introduced into Great Britain in the 1870s. The water deer is the only species of true deer without antlers. Water deer use their tusks for territorial fights and are not related to carnivores. Water deer are proficient swimmers, and can swim several miles to reach remote river islands. The water deer has narrow pectoral and pelvic girdles, long legs, and a long neck.