Protuberance on head variable. Female slightly paler with duller iris. Juvenile paler than female, especially on head and neck. Subspecies vary in structure and colour.
Distribution
Scratchpads developed and conceived by (alphabetical):
Ed Baker,
Katherine Bouton
Alice Heaton
Dimitris Koureas,
Laurence Livermore,
Dave Roberts,
Simon Rycroft,
Ben Scott,
Vince Smith
