Clockwork owl

A clockwork owl was one of Archibald Angelchrist's most prized possessions. It was given to him by a dear friend. The Eleventh Doctor studied the owl when he visited Angelchrist's laboratory. (PROSE: Paradox Lost) The owl was present in Maurice Newbury's home in 1903. (COMIC: The Undying)

Behind the scenes
The clockwork owl first appeared in Mann's 2009 Newbury & Hobbes novel The Osiris Ritual. At this point the owl belonged to Maurice Newbury, and would later be seen again as one of Newbury's possession in The Undying comic a decade later. The short story The Shattered Teacup, collected in The Casebook of Newbury & Hobbes, told the story of Newbury's acquisition of the owl from a Lord Carruthers. The NSA novel Paradox Lost introduced Archibald Angelchrist and presented him as the owl's owner given to him year earlier by an "old and very dear friend".