White Falcon by Giuseppe Castiglione

This trained falcon appears at the court perched on a stand with gleaming white plumage speckled gray and brown on the back of its head and wings. The red crossbar has a soft leather pad for the falcon to grip and protect its talons. Below, the stand is draped with a piece of brocaded cloth over the screen to prevent the rope tied to the bird's leg from becoming tangled on the crossbar. The stand, though quite detailed and realistic, is not from the hand of Giuseppe Castiglione, who depicted the falcon. According to a record from the archives of the imperial workshops, in the first lunar month of the year this falcon was submitted to the court as tribute (1765), the painter Yao Wenhan (fl. ca. 1743-1774) took part in rendering the stand, screen, and brocade of a work.
The Khalhka Mongol Beile Ayur presented this white falcon as tribute in that year, this hanging scroll representing the latest signed work by Castiglione. He did it at the age of 77, dying the following year of illness in Beijing. source
姚文瀚（約活動於1743至1774）畫鷹架、簾子、錦袱