Appendix
Fig. 1. Image by Stock.xchng. http://www.sxc.hu/photo/643816
Fig. 2. Image by Andreas Trepte (Creative Commons License) http://commons.wikimedia.org/wiki/File:PollenApis_mellifera_Western_honey_beeDetail.jpg
Fig. 3. Image by Dr Michel Royon (Creative Commons License) http://commons.wikimedia.org/wiki/File%3AEssaim_37_.jpg
Fig. 4. Image by Smithsonian Institute. http://www.discoverlife.org/mp/20q?search=Bombus+polaris
Fig. 2. Image by Andreas Trepte (Creative Commons License) http://commons.wikimedia.org/wiki/File:PollenApis_mellifera_Western_honey_beeDetail.jpg
Fig. 3. Image by Dr Michel Royon (Creative Commons License) http://commons.wikimedia.org/wiki/File%3AEssaim_37_.jpg
Fig. 4. Image by Smithsonian Institute. http://www.discoverlife.org/mp/20q?search=Bombus+polaris