Flightless bird more species of flightless birds (including the kiwi, several species of penguins, the takahe, the weka, the moa, and several other extinct species) than any other such location. One reason is that until the arrival of humans roughly a thousand years ago, there were no large land predators in New Zealand; the main predators of flightless birds were larger birds. Ratites belong to the superorder Palaeognathae birds, which include the volant tinamou, and are believed to have evolved flightlessness independently multiple times within their own group. Some birds evolved flightlessness in response to the absence of predators, for example on
Southern Hemisphere Auroral Radar Experiment Southern Hemisphere Auroral Radar Experiment The Southern Hemisphere Auroral Radar Experiment (SHARE), started 1988, is an Antarctic research project designed to observe velocities and irregularities of electrical fields in the ionosphere and magnetosphere. SHARE is operated jointly by the University of Natal, Potchefstroom University, the British Antarctic Survey and Johns Hopkins University and operates out of British Halley Station, South African SANAE IV Station and Japanese Showa Station. Using a total of 16 antennas, each mounted on a 12 m tower and radiating on fixed frequencies in the 8–20 MHz range, SHARE transmits an RF pulse into the upper atmosphere