It's not often you learn a new word at my age, but here's one: halteres. You can see a couple in this picture of a Daddy Long-legs or Cranefly, the first of its kind ever to make this blog. Huzza! They are the little appendages with a knob on the end, like a Morris Minor gearstick, poking out on either side of the insect where its hindwings would be, if it had them. Aeons ago, daddy long-legs had hindwings, as dragonflies do, but they evolved into halteres, which are best described as flight guidance instruments. Through vibrations, they send messages to daddy long-legs brain control, and keep the insect on course and the right way up etc. Mind you, I wouldn't want to rely on them in civil aviation. Have you ever seen a daddy long-legs in flight? Harking back to my Airfix kit days, it compares with your average fly in the same way that a Lysander or German Stork plane did to a Spitfire or ME109. if you click on the pic, it will come up much bigger.
I took my second picture on an excursion up to my tree house, which I am getting ready for a visit from Ian Mayes, who is writing the latest history of the Guardian.