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 Post subject: Re: Giraffe
Unread postPosted: Fri Jan 14, 2011 5:59 pm 
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Location: Vrikin stad ek haat dit!!!!! wil weer trug Nelies toe gaan!!!!
Interesting fact about the giraffe is its head cannot go below its hart because it wil die of to much blood on the brain and thats whay thay go down like thay do when thay drink.

Thay have a netting of veins behind there brain that keeps the blood away from the brain for 60 seconds so htat thay can drink.

Thats whay you will never find a giraffe drinking longer than 60 seconds.!!!

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 Post subject: Re: Giraffe
Unread postPosted: Fri Jan 14, 2011 9:02 pm 
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Wildlover, no, not quite. The simple reason for them going down like that to drink is that their neck is shorter than their front legs and body combined so, unless they bend funny like that, they'll never be able to drink.

When they drink their heads do go below their heart. But you're correct, if they didn't have a system in place they would die, and then on the flipside pass out should they suddenly get up as there wouldn't be any blood.

Here's a shot off the webcams that Imberbe posted some time ago on a quiz, showing how low the head goes.

Image

And off there the answer also comes in terms of why don't die of stroke, nor pass out:

Quote:
A giraffe's heart, which can weigh up to 10 kg (22 lb) and measure about 60 cm (2 ft) long, has to generate around double the normal blood pressure for an average large mammal in order to maintain blood flow to the brain against gravity. In the upper neck, a complex pressure-regulation system called the rete mirabile prevents excess blood flow to the brain when the giraffe lowers its head to drink. Conversely, the blood vessels in the lower legs are under great pressure (because of the weight of fluid pressing down on them). In other animals such pressure would force the blood out through the capillary walls; giraffes, however, have a very tight sheath of thick skin over their lower limbs which maintains high extravascular pressure in exactly the same way as a pilot's g-suit


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That is the secret! It is also called a "blood sponge".

It is a unique (if I remember correctly the Okapi has a similar but only very rudimentary one) and very intricate system the giraffe developed. Basically it is an organ sitting just below the brain, with many blood vessel, which is packed closely together. As the blood pressure increases when the giraffe bends down, the increased pressure forces the vessels closer together. This hinders the flow of the blood by constricting the vessels. This blocks the higher pressure and limits the amount of blood coming through, protecting the brain, while at the same time ensuring that enough blood do reach the brain for it to continue functioning normally.


Wonderful animals indeed!!

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 Post subject: Re: Giraffe
Unread postPosted: Sat Jan 15, 2011 4:02 am 
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Location: Planning to be in kruger again.........
Taken at croc bridge-

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 Post subject: Re: Giraffe
Unread postPosted: Wed Jul 06, 2011 10:42 am 
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This leucistic Giraffe was seen in Kruger just below Lower Sabie in May this year.

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 Post subject: Re: Giraffe
Unread postPosted: Sat Jul 23, 2011 10:26 am 
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Interesting sighting Elsa.
Looking through my earlier photos I came across this Giraffe which shows just how supple a Giraffes neck is. This photo was taken way back in Nov 2005 and I have not witnessed anything like this since.

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 Post subject: Re: Giraffe
Unread postPosted: Sun Jul 24, 2011 7:40 pm 
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:lol: :lol: Amazing picture.


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 Post subject: Giraffe Eating Bones
Unread postPosted: Tue Aug 02, 2011 4:19 pm 
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We have photo's of a giraffe eating bones has anyone else ever heard of this activity? :|

Regards Tim

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 Post subject: Re: Giraffe Eating Bones
Unread postPosted: Tue Aug 02, 2011 4:24 pm 
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Never seen it - but heard about it plenty of times from guides before. They apparently do it to get their needed dose of minerals - kind of like a salt lick I guess... :P


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 Post subject: Re: Giraffe Eating Bones
Unread postPosted: Tue Aug 02, 2011 7:21 pm 
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Watched at giraffe having a marvelous chew in May in Mafikeng Game Reserve.
He moved his head into all kind of weird angles to move round the bone as he chewed.
I watched him for a good 10 minutes and he was at it when I arrived.


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 Post subject: Re: Giraffe Eating Bones
Unread postPosted: Fri Aug 05, 2011 1:37 pm 
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Dear Tim I have also seen this strange behaviour.

In Andy and Tinker's Map and Guide book of Pilanesberg. Giraffe are predominantly browsers, feeding off leaves, but they do graze and they are also known to suck and chew bones from which they get their Calcium and other minerals. Other animals like porcupines are known to do this too. This unusual behaviour is called Osteophagia.

Warthogs are often seen eating fresh elephant dung. Elephants do not digest their food very well and in this way warthogs receive a nutrient rich meal. This practice is called coprophagia.

Here is one of my pics of a Giraffe practising this unusual behaviour.

http://s1178.photobucket.com/albums/x371/peteralanbartlett/
Hope you find the above interesting. Regards Mama Faru.


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 Post subject: Re: Giraffe Eating Bones
Unread postPosted: Fri Aug 05, 2011 1:53 pm 
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Other animals does it also..................

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 Post subject: Re: Giraffe Eating Bones
Unread postPosted: Wed Aug 31, 2011 7:06 pm 
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Here are the pics Dad.

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 Post subject: Re: Giraffe
Unread postPosted: Fri Mar 02, 2012 6:19 pm 
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 Post subject: Re: Giraffe
Unread postPosted: Wed May 16, 2012 6:17 pm 
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This photo of a giraffe was taken close to Berg-en-Dal in the Kruger National Park.

Image

Did You Know? :hmz:
The name Giraffe is derived from the Arab word 'Xirapha', which means 'one who walks very fast'.

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Last edited by Leeukos on Wed May 16, 2012 6:22 pm, edited 1 time in total.

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 Post subject: Re: Giraffe
Unread postPosted: Wed May 16, 2012 6:21 pm 
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Giraffes drinking water at Nhlanguleni picnic spot in the Kruger National Park.

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Did You Know? :hmz:
The Giraffe has equal number of cervical vertebrae as a human being despite its very long neck.

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