I have to download several polygons or raster files of species distribution maps according to IUCN I i'm not aware of any method to do this in a "batch" form.
I was interested in several species of mammals, and just downloaded the terrestrial mammals from http://www.iucnredlist.org/technical-documents/spatial-data. It gives you all taxa which you can then select the ones you are interested in
Hey guys, I was a bit confused since bird data of IUCN is stored at Birdlife international. One that wishes to get such data, must start a process of data request in birdlife datazone. The request will be processed and in a few days, they answer with the permission and further information.