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Formica obscuripes
''Formica obscuripes'' (the western thatching ant) is a species of ant in the family Formicidae. It is native to North America. It produces large mounds covered by small pieces of plant material. The number of adult workers per colony may be as high as 40,000. ''F. obscuripes'' feeds upon a number of insect species, consumes nectar from homopterous insects they tend, and occasionally eats plant tissue.〔 In the Blue Mountains of Oregon, ''F. obscuripes'' has demonstrated the capacity for polydomy. A supercolony in a four-hectare study area near Lehman Hot Springs consisted of 210 active nests with an estimated population in excess of 56 million ants.〔McIver, et al.|〕
==Nests==
''F. obscuripes'' produce large dome-shaped mounds composed of varying material. The composition of the nest is based upon the immediate plant environment and is commonly referred to as "thatch". The size of these mounds is highly variable and dependent on the age and health of the colony. The height of the average mound ranges from 1 inch (1.5cm) to 18 inches (45.7cm), although nests of larger heights are not uncommon. Nests can extend up to 4 feet (1.2 meters) into the ground. The mounds are typically constructed in a open areas devoid of cover and are often formed around a structure. The condition of the thatched mound is in a constant state of change due to activities by the ants and environmental factors.
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When a colony possesses a suitable amount of adult workers, the ants proceed to chew off the bark at the base of plants growing on or nearby the mound. Formic acid is ejected (sprayed) into the open layer eventually felling the plant. ''
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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