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Cinnabar (mercury sulphide - HgS) is the single most toxic mineral to handle on earth. It is the worldâs main source of mercury and has been mined since Neolithic times. However, when oxidized, this element will produce methyl mercury and dimethyl mercury, two toxic compounds that cause irreparable harm to the nervous systems of children. It is deadly in small concentrations and can be absorbed through the respiratory tract, intestines, or skin.
Eucalyptus leaves are poisonous to most animals, but koalas have special bacteria in their digestive tract that break down the toxic compounds. They can tell which eucalyptus species are more toxic than others and only eat the less-toxic leaves.Special cheek teeth grind the tough eucalyptus leaves.ucalyptus leaves are poisonous to most animals, but koalas have special bacteria in their digestive tract that break down the toxic compounds. They can tell which eucalyptus species are more toxic than others and only eat the less-toxic leaves. Special cheek teeth grind the tough eucalyptus leaves.