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 Post subject: Re: Mammal ID Needed?
Unread postPosted: Mon Jan 11, 2010 9:47 pm 
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Virtual Ranger
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Hi Louis!

Thanks for the explanation - I had no idea I was using the wrong terminology!

But would this critter be at a disadvantage? See Q above

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 Post subject: Re: these 2, white or black?
Unread postPosted: Tue Jan 12, 2010 7:21 am 
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The Rhinos on the photo you posted are definitely two white rhinos, a mother with a calf. The young ones will walk with their mothers for up to 7 yrs and I would say that the calf shown on the pic is about that age. RUMURUTI, Black and White Rhino will never walk together like that...

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 Post subject: Re: Mammal ID Needed?
Unread postPosted: Tue Jan 12, 2010 9:26 am 
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No worry i was doing it as well. About colour blind in predators don't know will see what i can find.
The white animal in a hurd, well if predators are colour blind then it has the same change as its normal sisters and brothers.
If you look how old the impala is, by the size of its horn, and by the way it ran when i tryed to photo it, i don't think that he has any other disadvantace. he is just white in colour. He look in good health.

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 Post subject: Re: Mammal ID Needed?
Unread postPosted: Tue Jan 12, 2010 9:50 am 
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I was able to find this on the following web site.
"Cats can see colours; definitely green and blue and possibly red. However they see them much less intensely than we do and they appear to make no use of this ability. It is very hard to train a cat to distinguish two objects on the basis of colour rather than on a basis of reflectivity and brightness, and they appear to be effectively colour-blind. Furthermore a cat sees objects less distinctly than we do. In daylight a cat would fail to appreciate the fine filigree patterns on the wings of the moth Habrosyne pyritoides even though it would be able to see the moth flying past on a dark night when we would fail to see it at all."

Th site name is :http://www.earthlife.net/mammals/cats.html.

According to this statement the white impala or animal has an equal change during the day, but at night it's a different story. Lighter colour seem to stand out more than darker colours.

Maybe we have some body that can assit us in this matter.

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 Post subject: Re: white or black? wHO HELPS?
Unread postPosted: Tue Jan 12, 2010 10:24 am 
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White rhino 100%.

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 Post subject: Re: white or black? wHO HELPS?
Unread postPosted: Tue Jan 12, 2010 11:16 am 
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White. Lump on neck and in the other thread photo, bump on back between neck and rump. I have to admit in the other thread the angle of the photo made the lips look more like Black but the lumps and bumps were the deciding factor.

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 Post subject: Re: white or black? wHO HELPS?
Unread postPosted: Tue Jan 12, 2010 11:44 am 
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Definitely white, black rhino has a much smaller head and holds the head quite high since its a browser. The white rhino has a long head that is positioned toward the ground. Just look at these pics of the black rhino:

Image

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 Post subject: Re: white or black? wHO HELPS?
Unread postPosted: Tue Jan 12, 2010 12:20 pm 
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Agree ... white!

From the angle of the photos the mouth can be confusing. But it is not the only difference between white and black. There are two other clear differences visible from this photo.

As has already been stated, the bump on the neck clearly indicates that this is white. A blackie does not have this bump. The practical difference is that because of the bump a white rhino cannot lift his head high, while a blackie can, enabling it to browse the leaves from bushes, while the white is eating grass from the ground.

A second visible difference lies in the shape of the ears. The white has sharply pointed ears, while the black has more rounded ears.

The third difference, which is a bit hidden, but still visible on the second rhino to the back, is the shape of the back, as has also been mentioned.

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 Post subject: Re: Mammal ID Needed?
Unread postPosted: Tue Jan 12, 2010 2:30 pm 
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An albino or leucistic animal is most definitely at a disadvantage compared to the others around it. A solitary animal, or one in pairs, such as say a klipspringer, will be more disadvanted than a herd animal merely because of the lesser number of eyes keeping watch.

The reason why it is disadvantaged when compared to the rest is the colour difference. Take a photo in black and white, and see how the white stands out. That is in essence almost what an animal sees, though predators see a bit more. (BTW, birds do see a lot more colour.) Thus the albino or leucistic animal will stand out more than a normal, naturally coloured, one does.

Interestingly though, this specific specimen, due to the dappled colour, might just perhaps be at a slight advantage, or maybe just equal.

And remember that, when hunting herds, predators look for hurt, weak, sick, or oo-to-one-side-alone animals. Maybe that is also why this one was so skittish when you were trying to photograph him, Louis. He knew that he had to get within the herd to be reasonably safe.

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 Post subject: Re: Mammal ID Needed?
Unread postPosted: Tue Jan 12, 2010 7:07 pm 
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Thanks Bishop - interesting stuff! I was confused as to whether, even though the white impie stands out, predators really have a concept of "standing out". I knew that they could recognise an old or weak animal but when hunting they would be bothered by colour

Thanks again! :clap:

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 Post subject: Re: Mammal ID Needed?
Unread postPosted: Wed Jan 13, 2010 8:26 am 
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How often does this happen with the impies that a white one is born. Is there any indication from sanparks side. How many of them is still alive in Kruger.

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 Post subject: Re: Mammal ID Needed?
Unread postPosted: Wed Jan 13, 2010 11:11 am 
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I don't think there are any accurate statistics. KNP is a big park, and would be impossible to accurately monitor. It is also part of nature, and is accepted as such ... no need to monitor it.

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 Post subject: Re: Mammal ID Needed?
Unread postPosted: Wed Jan 13, 2010 2:27 pm 
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louis dreyer wrote:
The term that you are looking for here is leucistic, but the impala is NOT an albino, as albinism is the total absence of colour. To explain simply, leucistic means an unnatural prodminance of white colouring, whilst melanistic means an unnatural predominance of dark/black colouring. There seems to be considerable confusion about the terms leucistic and albino, with them far too often being used incorrectly and interchangeably..

Quoteing Arks in the following forum
viewtopic.php?f=21&t=2921&start=90" onclick="window.open(this.href);return false;


Nice explanation Louis. If you are ever lucky enough to get close to an albino animal of any kind , then a dead give away is the lack of natural pigmentation of the iris - albinos have pink eyes.


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 Post subject: Re: these 2, white or black?
Unread postPosted: Wed Jan 13, 2010 3:28 pm 
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White .... what is confusing is the fact that the front one is an immature ...

Now here you can actually see another distinguishing factor between the two species ... though this is not a water tight one.

Check the nicely curled up tail. When whites are agitated, the tail curls up like this. In the blackie ... it goes straight ... and then you know you have trouble! :twisted:

These are BTW the same two as in your other thread. :naughty: :wink: :lol:

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 Post subject: Re: these 2, white or black?
Unread postPosted: Wed Jan 13, 2010 4:08 pm 
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Imberbe thanks for the info...yesterday too :thumbs_up: , had no idea there there so many differences :hmz:

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