1. How to sex and age Grey Partridges (Perdix perdix) : identification guide for bird ringers and field observations /: identification guide for bird ringers and field observations. (2016) Authors: Bruner, Francis Other Names: Game & Wildlife Conservation Trust, publisher. Record Type: Book Extent: 1 online resource (6 unnumbered pages), illustrations (colour) View Content: Available online (eLD content is only available in our Reading Rooms) ↗