Bohaiornithidae of sexual dimorphism, with the feathers being used by male members of a species for courtship display. A subadult specimen of an indeterminate bohaiornithid described in 2017 preserved feathers on various parts of the head and body which were analyzed and determined to have been iridescent in life. A referred adult specimen of "Bohaiornis" was preserved with a several rocks concentrated in the stomach region. Rocks in the stomach of birds and other animals are often believed to be gastroliths swallowed to assist in the digestion of plant material. However, the rocks apparently swallowed by this specimen are much larger,
Five Go to Demon's Rocks Lighthouse Game" (1985) was based on this novel. Five Go to Demon's Rocks Five Go to Demon's Rocks is the nineteenth novel in "The Famous Five" series by Enid Blyton. It was first published in 1961. Julian, Dick and Anne are coming to Kirrin to stay for a couple of weeks with their cousin, George (Georgina by rights), but Quentin's colleague Professor Hayling and his son Tinker (and monkey Mischief) arrive first. There isn't enough room at Kirrin Cottage for everybody to stay, so Tinker suggests he and the Five go to his lighthouse at Demon's Rocks up the coast.