violon d'Ingres [vɪˈəʊlɒn ˈdængrə] n.
1.) An occasional pastime, an activity other than that for which one is well-known or at which one excels (O.E.D. 2nd Ed.).
Etymology: French, literally "Ingres’ violin". Jean Auguste Dominique Ingres (1780—1867) was a French Neoclassical painter who also played the violin.
"But archaeology was much more than Freud's violon d'Ingres and provided him both as a clinician and as a writer with a versatile set of conceptual modes. This celebrated moment from his essay on 'Female Sexuality' (1931) is characteristic of one use to which archaeological material may be put: 'Our insight into this early, pre-Oedipus, phase in girls comes to us as a surprise, like the discovery, in another field, of the Minoan-Mycenean civilization behind the civilization of Greece' (XXI, 226)" (Freud, Proust, and Lacan: Theory as Art, Malcolm Bowie, 1987).
Cheers to everyone who responded to my little moral dilemma. The correct answer was: it doesn't matter what I do because animals have no moral significance. Thanks for reading!