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«Ecological Life, Pollution, The Nature»

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The world's most dangerous creatures - Tsetse fly
Every year at least 10,000 people lose their lives because of the them. It is an African bloodsucking fly which bites humans and other mammals, transmitting sleeping sickness and nagana, which is a disease of cattle, antelope, and other livestock in southern Africa, characterized by fever, lethargy, and oedema, and caused by trypanosome (a single-celled parasitic protozoan with a trailing flagellum, infesting the blood) parasites transmitted by the tsetse fly.

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