Update README.md

README.md

@@ -11,7 +11,9 @@ license: apache-2.0
 
 A FocalNet image classification model. The model follows a two-stage training process: first undergoing intermediate training on a large-scale dataset containing diverse bird species from around the world, then fine-tuned specifically on the `eu-common` dataset (all the relevant bird species found in the Arabian peninsula inc. rarities).
 
-The species list is derived from data available at <https://avibase.bsc-eoc.org/checklist.jsp?region=ARA>.
+The species list is derived from the Collins bird guide [^1].
+
+[^1]: Svensson, L., Mullarney, K., & Zetterström, D. (2022). Collins bird guide (3rd ed.). London, England: William Collins.
 
 ## Model Details