flies
... that flies have a single pair of wings for flight, the hind wings being modified into tiny gyroscopic organs known as "halteres"?
... that <b id="mwAl0"><a href="./Fly" id="mwAl4" rel="mw:WikiLink" title="Fly">flies</a></b> <i id="mwAl8">(crane fly pictured)</i> have a single pair of wings for flight, the hind wings being modified into tiny <a href="./Gyroscope" id="mwAmA" rel="mw:WikiLink" title="Gyroscope">gyroscopic organs</a> known as "<a href="./Halteres" id="mwAmE" rel="mw:WikiLink" title="Halteres">halteres</a>"?