You are quite correct, War Arrow, in suggesting that the Haggis perfectly illustrates the Darwinian model, although a form of accelerated evolution appears to have been prompted 2,000 years ago when Hadrian built his wall and created a sealed ecosystem in Scotland.
The Lowland Haggis with legs of equal length (Hagii par tractus) is thought to have died out in the latter half of the eighteenth century when the slow-moving and trusting animals were used for target practice by English garrisons stationed in the country after the Battle of Culloden in 1746.
It is sad to recount that -- as with the slaughter of the dodo by Portugese sailors -- the extinction of the Lowland haggis can not be justified by hunger as the English soldiery found the flesh 'beyond the sufferance of civilised palate'.
The Highland haggis, however, with its elegantly developed legs of unequal length (Haggii iniquus tractus) proved more elusive and breeding pairs are known -- from droppings, abandoned nests, etc -- to be extant in the wild.
The haggis you will be familiar with, of course, is farmed; mostly in China.
Although the Beano is the manuscript most referred to by modern comicologists, it does in fact post date the Dandy by some eight months. The earliest texts we have are (translated from the Lalland Scots [Dundee dialect]): Dandy, Dec 1937; Beano Aug 1938. The Book of Dan the Desperate can be accurately dated to December 1940.
Pizza and chips, although considered modern, is actually an ancient dish developed in an (unsuccessful) attempt to gain the trust of lowland Picts by Roman expeditionary forces of the First Neapolitan Legion (circa 120 BCE).
Hope this information is of some help in your studies, WA.