21: Chapter 23. Kehaar  21.1 Burrowkeeping   A couple of mistakes from last week.  I got the Chapter number wrong. It was Chapter 22 not 21. I have corrected the episode title and notes. I also referred to Hazel as Holly a couple of times.  21.2 Chroicocephalus ridibundus or the Black-headed Gull  The back-headed gull is a small gull. They have red beaks, as opposed to the yellow/orange beaks of larger white-headed seagull species. The black head is actually dark brown and moults in winter, leaving a patch behind each eye.  Although Kehaar has been portrayed on film as keeping his black head throughout the story, there is actually a clear reference to his head moulting during the course of this chapter, leaving just a brown patch behind each eye.   Can these gulls moult prematurely if they don't get to mate? Or did Adam's make a mistake by ha ...