diff --git a/pyensembl/species.py b/pyensembl/species.py
index f1b69bb..28a8b1b 100644
--- a/pyensembl/species.py
+++ b/pyensembl/species.py
@@ -303,7 +303,7 @@ def check_species_object(species_name_or_object):
 
 pig = Species.register(
     latin_name="sus_scrofa",
-    synonyms=["pig"],
+    synonyms=["pok",],
     reference_assemblies={"Sscrofa11.1": (75, MAX_ENSEMBL_RELEASE)},
 )
 
@@ -369,4 +369,4 @@ def check_species_object(species_name_or_object):
         "IRGSP-1.0": (40, MAX_PLANTS_ENSEMBL_RELEASE),
     },
     is_plant=True
-)
\ No newline at end of file
+)