The bull giraffe is roughly 18 feet tall with a heart as large as 2 1/2 feet long. Its heart acts as a powerful pump in bringing blood up its long, skinny neck against gravity.
When it bends down to get a drink of water, the powerful heart pumps a large burst of blood with gravity down the neck that one would expect to hit its brain and burst it, killing it. A simple drink would blow its brains out and there would be no opportunity for it to evolve.
The giraffe does not explode because there is a series of valves in his arteries up his neck that close. The last pump is beyond the last valve and would provide enough blood to bust the small arterials of the brain, but it doesn't go into the brain. The last pump goes underneath the brain into an area similar to that of a sponge that gently expands. This sponge holds the last bit of blood uncontrolled by valves until it is needed when it raises its head.
A giraffe that detects a lion approaching will suddenly raise its head to flee. If it wasn't equipped for the sudden shift in blood, with the lack of oxygen now in the brain, it would go just a few steps before crumpling from oxygen deprivation. If it fell, it would be killed by its prey and never have a chance to evolve. Fortunately, when it begins to bring its head up the little valves in the arteries open and the sponge gently releases the last bit of blood to the brain - providing the oxygen needed.
If all of these parts weren't there to start with, the giraffe would have died as soon as it needed its first drink of water. These parts had to be there from the very first giraffe for it to survive, defying evolution and suggesting creation.
Learn about many other creatures that defy evolution by viewing the "Incredible Creatures that defy Evolution I, II, and III" by Dr. Jobe Martin.