Normal whitefish also grow much bigger and live much longer than the dwarf ecotype. This "ecotype" is called the "xeric" type. Sleeper sharks are preyed on by the offshore ecotype of killer whales off British Columbia. The symptoms exhibited vary depending on the viral strain, host ecotype, and environmental conditions. Ecotype 1 occurs down to about while ecotype 2 occurs down to about . The "Adenostoma" ecotype is also smaller, with a wider head, and shorter legs. The RB ecotype (Ridged and Banded) lives on barnacles in the upper shore. The SU ecotype (Smooth and Unbanded) is found at the lower shore living on mussels. Ecotype, ecotope, or biotope aquaria is another type based on species selection. Moisture level demands and tolerance depend upon the subspecies and possibly ecotype. Caribou herds can be classified as a northern or mountain woodland ecotype. This ecotype is recognized by its blunt-lobed leaves, which may have a red tint.