Let's study ID: giraffe plumbing (Introduction)

by David Turell , Wednesday, March 15, 2023, 19:36 (399 days ago) @ David Turell

more on the neck:

https://evolutionnews.org/2023/03/evolutions-tall-tale-the-giraffe-neck/

"There should be a good reason for the extraordinary length, because it causes hardship. A giraffe’s heart needs to pump blood 2 metres up to the head, which requires a high blood pressure and management to avoid fainting or stroke. “It’s beautifully adapted to this, but it’s a big cost,” says Rob Simmons, a behavioural ecologist at the University of Cape Town in South Africa, who was not involved in the study.

"One prevailing theory is that giraffes evolved longer necks to reach higher trees for food. “This is widely believed; it’s really entrenched,” says Simmons…. [But] research has shown that giraffes tend to eat from lower levels, and tall giraffes aren’t more likely to survive drought, when food competition is highest. Another idea is that giraffes evolved longer necks for sexual competition, with male giraffes engaging in violent neck-swinging fights and longer necks attracting mates…. [But] males don’t have longer necks than females.

***

"No continuous series of fossil links leads to the Giraffa or Okapia. “The giraffe and the okapi of the Congo rain forest are considered as sister groups, the origins of which are still not known”. Similarly Starck (1995, p. 999) remarks: “The ancestry of Giraffidae is disputed.” Wesson agrees with these statements about giraffe fossils, as follows: “The evolving giraffe line left no middling branches on the way, and there is nothing, living or fossil, between the moderate neck of the okapi and the greatly elongated giraffe. The several varieties of giraffe are all about the same height.”

***

"Lönnig describes several things that must be either engineered or reengineered to arrive at a functional giraffe from a short-necked ancestor. First, giraffes, like cows and many other grazing animals, are ruminants, meaning they regurgitate a half-digested cud and chew on it before swallowing the food a second time, helping them digest tough fibrous grass and leaves. But to pull off this trick, a giraffe, with its neck as tall as a man, needs “a special muscular esophagus,” Lönnig explains. So that’s one reengineering challenge.

"Lönnig gives so many more that there isn’t room for them all here. His book debunking giraffe evolution, The Evolution of the Long-Necked Giraffe, is dense and thorough. But he helpfully quotes Gordon Rattray Taylor, who concisely summarized several of the reengineering challenges in his book The Great Evolution Mystery:

"Nineteenth-century observers assumed that the giraffe had only to develop a longer neck and legs to be able to reach the leaves which other animals could not. But in fact such growth created severe problems. The giraffe had to pump blood up about eight feet to its head. The solution it reached was to have a heart which beats faster than average and a high blood pressure. When the giraffe puts his head down to drink, he suffers a rush of blood to the head, so a special pressure-reducing mechanism, the rete mirabile, had to be provided to deal with this. However, much more intractable are the problems of breathing through an eight-foot tube. If a man tried to do so, he would die — not from lack of oxygen so much as poisoning by his own carbon dioxide. For the tube would fill with his expired, deoxygenated breath, and he would keep reinhaling it. Furthermore, one study group found that the blood in a giraffe’s legs would be under such pressure that it would force its way out of the capillaries. How was this being prevented? It turned out that the intercellular spaces are filled with fluid, also under pressure — which in turn necessitates the giraffe having a strong, impermeable skin. To all these changes one could add the need for new postural reflexes and for new strategies of escape from predators. It is evident that the giraffe’s long neck necessitated not just one mutation but many — and these perfectly coordinated.

"In short, the giraffe represents not a mere collection of individual traits but a package of interrelated adaptations. It is put together according to an overall design that integrates all parts into a single pattern. Where did such an adaptational package come from? According to Darwinian theory, the giraffe evolved to its present form by the accumulation of individual, random changes preserved by natural selection. But it is difficult to explain how a random process could offer to natural selection an integrated package of adaptations, even over time. Random mutations might adequately explain change in a relatively isolated trait, such as color. But major changes, like the macroevolution of the giraffe from some other animal, would require an extensive suite of coordinated adaptations."

"In the giraffe’s case, a bit of reasoning goes a long way. Blind evolution doesn’t look ahead and coordinate a group of changes for some future advantage. It’s blind and must proceed by one small useful step at a time. No evolutionist, for instance, believes that a small number of mega-mutations turned a land mammal into a whale."

Comment: We've been here before. The giraffe has no fossil ancestors, so we have a giraffe gap!!! The last paragraph is an ID comment. Most of the quotes are taken directly from a Nature article. From a devoted propaganda source for Darwinism!!! Wow!!!