Four eagles

This drawing can be compared to other animal studies, executed in the same technique, such as Studies of falcons (Paris, private collection; H. N. Opperman, Jean-Baptiste Oudry, Ph.D., University of Chicago, 1972, no. D. 933A, ill.), Raptor on a branch (Hôtel Drouot, Paris, 4 April 1991, lot 5) and Study of a vulture in the Louvre (inv. 31487). We are grateful to Hal N. Opperman for confirming the attribution on the basis of a digital photograph.