Columbia subject headings:
Animals in literature--Congresses.
Animals--Mythology--Congresses.
Animals--Social aspects--Congresses.
Ethics, Ancient--Congresses.
Philosophy, Ancient--Congresses.
Harvard subject headings:
Animals--Social aspects.
Princeton subject headings:
Animal welfare--Philosophy--History--Congresses.
Ethics, Ancient--History--Congresses.
Philosophy of nature--History--Congresses.
Philosophy, Ancient--History--Congresses.