Myrmecia
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[Photo] Australian Bullant. Taken by Fir0002 http://en.wikipedia.org/wiki/User:Fir0002

Myrmecia, often called bulldog ants, bull ants, or jack-jumpers (although jack jumper really only describes a specific species in the genus and not all species), is a genus of ants. Bull ants can grow to over 2 cm in length.

These ants are well-known in Australia for their aggressive behavior and powerful stings. The venom of these ants has a chance to induce anaphylactic shock in allergic sting victims. As with most severe allergic reactions, if left untreated the reaction may be lethal. These large, alert ants have characteristic large eyes and long, slender mandibles and they have superior vision, able to track and even follow intruders from a distance of 1 meter.

http://en.wikipedia.org/wiki/Myrmecia

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