Remains of animal bones give us first class evidence about the gestures practised in Gallo-Roman sanctuaries. The archaeozoological analysis of the sites of Moyencourt “ Les Hauts du bois de Piques” (Viromandui) and Authevernes « Les Mureaux » (Veliocasses), in the North of France, gives the opportunity to tackle questions related to butchery practices in sacred enclosures, and to the sacrifice and burial of animals. The two examples discussed here show the complexity of the approaches, on the one hand because of the tenuous nature of the traces that might connect archaeological remains with cultural practices (at Moyencourt), hence the very definition of these sites, and on the other hand because of the difficulty in the interpretation of the gestures involved in cases where animals have been found buried intact with pottery beside them (Authevernes). Traduction : Margaret & Jean-louis CADOUX.