Not only are giraffes the tallest land animal on earth, they also possess the longest neck of any living creature. So long is the giraffes neck that if it want to take a drink it can't simply lower its head, it has to give itself a fighting chance by either spreading its front legs, bend its knees, or kneel on the ground - a risky move by a water hole no matter how big you are!
It suggests that competitive pressure from smaller browsers, such as kudu, steenbok and impala, encouraged the elongation of the neck, as it enabled giraffes to reach food that competitors could not. This advantage is real, as giraffes can and do feed up to 4.5 m (15 ft) high, while even quite large competitors, such as kudu, can only feed up to about 2 m (6 ft 7 in) high. There is also research suggesting that browsing competition is intense at lower levels, and giraffes feed more efficiently (gaining more leaf biomass with each mouthful) high in the canopy.
However, scientists disagree about just how much time giraffes spend feeding at levels beyond the reach of other browsers.
However, one objection is that it fails to explain why female giraffes also have long necks. However, this ridiculous objection is as intelligent as questioning the need for the male nipple. If human males did not have the genetic information for nipples then Mendelian theory would dictate that you would have a selection of human offspring displaying one nipple, two nipples, or no nipples at all! Therefore, if female giraffes had short necks then you would end up with progeny with a selection of neck sizes. This is isn't going to be very helpful when it come to impressing your future giraffe 'wife' in the next neck bashing competition!
Giraffes have oesophageal muscles that are unusually strong to allow regurgitation of food from the stomach up the neck and into the mouth for rumination.
They have four chambered stomachs, as in all ruminants, and the first chamber has adapted to their specialized diet.
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Based on an article from http://en.wikipedia.org/wiki/Giraffe
Images care of http://www.timelessafrica.com/index.php?L1=destinations&L2=botswana&L3=linyanti and http://rankabut.blogspot.co.uk/2009/06/design-in-nature-8.html