Changes

* the migrations of butterflies and birds, and the mechanisms which allow them to navigate.<ref>[[migration]]</ref>

* the migrations of butterflies and birds, and the mechanisms which allow them to navigate.<ref>[[migration]]</ref>

* The neck of the [[giraffe]]. Although the length of the neck can be explained by simple sexual selection, the presence of valves in the neck (which are necessary because of its great length) raises a question of how one could have arisen without the other being there first (see the irreducible complexity argument).<ref>[http://www1.pacific.edu/~e-buhals/GIRAFFE2.htm]</ref>  

* The neck of the [[giraffe]]. Although the length of the neck can be explained by simple sexual selection, the presence of valves in the neck (which are necessary because of its great length) raises a question of how one could have arisen without the other being there first (see the irreducible complexity argument).<ref>[http://www1.pacific.edu/~e-buhals/GIRAFFE2.htm]</ref>  

* The development of feathers, which could not have conceivably "grown" from the scales of dinosaurs<ref>http://icb.oxfordjournals.org/cgi/reprint/40/4/687.pdf</ref><ref>[http://palaeoblog.blogspot.com/2008/02/early-evolution-of-feathers.html]</ref>

* The development of feathers, which could not have conceivably "grown" from the scales of dinosaurs<ref>http://icb.oxfordjournals.org/cgi/reprint/40/4/687.pdf</ref><ref>[http://palaeoblog.blogspot.com/2008/02/early-evolution-of-feathers.html]</ref>

*[[Pterosaurs]]; a scientist recently stated that they could not have flown, but why then did they evolve wings?<ref>http://www.physorg.com/news142086647.html</ref>

*[[Pterosaurs]]; a scientist recently stated that they could not have flown, but why then did they evolve wings?<ref>http://www.physorg.com/news142086647.html</ref>