Tuesday, 7 October 2008

Grove Snail

Here is a film of the White lipped Grove Snail. The Grove Snail, while a common mollusc has a great deal of variability in the banding on the shell so it can be difficult to determine the species. It is a scientifically important species, as it is one of the species that proves Evolution and natural selection.

The banding provides camouflage from thrushes, it main predator. The greater the variation in the banding the better hidden the mollusc is in the grass. Thus more likely to breed and hence the snails evolve to avoid predation. As agricultural practices have changed over the past century so the variation has kept pace with these changes, thus providing an example of evolution in action.




No comments: