Some believe that the date "1881" can be deciphered on the red admiral's hind wings.
His model suggests the manoeuvrability that its hind wings granted the animal came at the expense of increased drag.
He was crucial in discovering the world's earliest known frog, which unlike its salamander-like ancestors had hind legs for jumping.
The remains belong to a new dinosaur called Kulindadromeus zabaikalicus, which comes from outside the theropod group, where most feather-like features have in the past been found.The remains of K. zabaikalicus are dated middle-to-late Jurassic and reveal a 1.5-metre-long plant-eating dinosaur with elongated hind limbs, short forelimbs and a long tail.
Flies use a pair of tiny organs called halteres that have evolved from the animals' hind wings and are shaped like balls on sticks.Several groups of researchers are looking into insect inertial guidance.
The question was, would this stimulation be enough to get the rats walking again?To find out, he used a special harness which held the rats upright over a treadmill, with their hind feet touching the mill.
But the results are so extraordinary that they should give hope to human sufferers.Dr Courtine paralysed his rats by cutting their spinal cords in two places, so that the animals could no longer move their hind legs.
His dusty compound has a few mud and straw huts, some plastic chairs, and goats reaching up to bare branches on their hind legs.
It took biologists until 2010 to prove that Asian elephants can run: they do so with the front legs; the hind ones merely walk quickly to keep up.
The cuts he made did not completely sever the cord, so some nerve fibres still ran from the rats' brains to their lower bodies, but the signals transmitted by these fibres were not powerful enough to allow a rat to use its hind legs.
After an average of six weeks of training, food-motivated rats were able to walk on their hind legs, even with the treadmill switched off.
