diff --git a/src/fellchensammlung/urls.py b/src/fellchensammlung/urls.py
index 0a2c37e..192dae0 100644
--- a/src/fellchensammlung/urls.py
+++ b/src/fellchensammlung/urls.py
@@ -43,7 +43,7 @@ urlpatterns = [
     path("tierschutzorganisationen/", views.list_rescue_organizations, name="rescue-organizations"),
     path("tierschutzorganisationen/<int:rescue_organization_id>/", views.detail_view_rescue_organization,
          name="rescue-organization-detail"),
-    path("tierschutzorganisationen/spezialisierung/<int:species_id>", views.specialized_rescues,
+    path("tierschutzorganisationen/spezialisierung/<slug:species_slug>", views.specialized_rescues,
          name="specialized-rescue-organizations"),
 
     # ex: /search/
diff --git a/src/fellchensammlung/views.py b/src/fellchensammlung/views.py
index b00df49..855d58f 100644
--- a/src/fellchensammlung/views.py
+++ b/src/fellchensammlung/views.py
@@ -804,8 +804,8 @@ def list_rescue_organizations(request, species=None, template='fellchensammlung/
     return render(request, template, context=context)
 
 
-def specialized_rescues(request, species_id):
-    species = get_object_or_404(Species, pk=species_id)
+def specialized_rescues(request, species_slug):
+    species = get_object_or_404(Species, slug=species_slug)
     return list_rescue_organizations(request, species)