Changes

The volcanoes section makes absolutely no sense.  The 'example' of animals re-colonising Krakatoa after the eruption does not actually have any relevance to the point it is trying to prove.  I can't quite understand what this point is, but it looks as though it is meant to mean that animals would be picked up by a volcanic eruption and then deposited (unharmed) somewhere further on their journey.  While this does produce a funny mental image, it is completely and utterly ridiculous, and should probably be removed.  This article though doesn't deal with the main difficulty that I have always had with this scenario which is that, on the whole, there is a tendency for species to be found in geographically concentrated areas, for instance kangaroos in Australia, but not elsewhere.  Also, per the kangaroos example, often groups of similar 'related' species will be found in the same general area and not elsewhere.  I would have no idea where i could find sources or anything to improve this article, so I'll just leave this comment here and someone else could try to make changes.[[User:Cmurphynz|Cmurphynz]] 03:13, 17 July 2012 (EDT)

The volcanoes section makes absolutely no sense.  The 'example' of animals re-colonising Krakatoa after the eruption does not actually have any relevance to the point it is trying to prove.  I can't quite understand what this point is, but it looks as though it is meant to mean that animals would be picked up by a volcanic eruption and then deposited (unharmed) somewhere further on their journey.  While this does produce a funny mental image, it is completely and utterly ridiculous, and should probably be removed.  This article though doesn't deal with the main difficulty that I have always had with this scenario which is that, on the whole, there is a tendency for species to be found in geographically concentrated areas, for instance kangaroos in Australia, but not elsewhere.  Also, per the kangaroos example, often groups of similar 'related' species will be found in the same general area and not elsewhere.  I would have no idea where i could find sources or anything to improve this article, so I'll just leave this comment here and someone else could try to make changes.[[User:Cmurphynz|Cmurphynz]] 03:13, 17 July 2012 (EDT)