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''Atta cephalotes'' is a species of leafcutter ant in the tribe Attini (the fungus-growing ants). A single colony of ants can contain up to 5 million members, and each colony has one queen that can live more than 15 years. The colony comprises different castes, known as 'task partitioning', and each caste has a different job to do. ==Biology and behaviour== Ants are split into different castes. Soldiers are the largest of the ants and they often stand guard at the entrance of the nest, or will even go on scouting missions to watch for predators. Workers, who are all female, are divided into two types, media and minima, that both have big jaws and sharp teeth. Media workers are the larger of the two, and they cut the leaves and bring them back to the nest. These ants are able to navigate to the source of leaves by following the pheromone scent of the other ants ahead, a process known as ‘tandem running’. Once the media workers have deposited the material into the nest, slightly smaller workers called ‘minima workers’ cut up the leaves into small pieces and then feed it to a fungus they cultivate. They also cover the leaf in antibacterial saliva which stops other types of fungus growing. A special caste of workers manage the colony's rubbish dump. These ants are excluded from the rest of the colony. If any wander outside the dump, the other ants will kill or force them back. Rubbish workers are often contaminated with disease and toxins, and live only half as long as their peers. The smaller 'minima' workers feed the entire colony of ants. These minima workers also act as guards and follow the media workers or hitch a ride on the leaf they’re carrying to the source of the leaves and attack small parasitoids called phroid flies. The queen is larger than the other females and is winged. Her role is to give birth to workers. The females can be workers or soldiers, and cannot produce workers but instead produce males only. Males are also winged, and their only role is to inseminate the virgin queen. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Atta cephalotes」の詳細全文を読む スポンサード リンク
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