telepathically), and have personalities and opinions distinct from those of their riders. However, their intelligence does seem to be somewhat lower than that of the average human. In particular, their long-term memory is severely limited. Dragons' telepathic communication is usually limited to contact with their rider and with other dragons, however a dragon sometimes communicates well with a person with whom their rider has close emotional ties. They do understand spoken human language and occasionally reply telepathically to people whom they choose to speak. As a safeguard against the possible damage that could be caused by such powerful creatures, Ping engineered dragons to be profoundly psychologically dependent on their riders. Any dragonet that fails to Impress to a human shortly after hatching will die. If a dragon's rider dies, the dragon immediately suicides by going between without a destination. The only exception is when the rider of a queen dragon dies while the queen is gravid; the dragon waits just long enough to lay her eggs and see them hatch before disappearing between. (Humans who lose their dragons typically commit suicide as well. However, some do survive, although the experience leaves profound psychological trauma.) Ping also designed the dragons to be fairly calm in temperament. They never fight one another, unless two queens come into estrus at the same time. They are also not dangerous to humans except shortly after hatching, when it is common for confused and frightened dragonets to maul or even kill humans hoping to Impress. When a dragon hatches, they announce their names to their new riders upon Impression. Pernese dragons' names always end in -th. A watch-wher's name will end in "sk". Colors On canon Pern, barring rare mutations, female dragons and fire-lizards are always either green or gold in color, while males are blue, brown or bronze. Gold dragons, also called queens, are the largest dragons (40–45 feet or meters long) and the only fertile females. Gold dragons are by far the rarest dragons on Pern, at just less than one percent of the population. They are dominant over all other colors; any non-gold dragon will invariably obey a queen's orders, even against the wishes of its own rider. Queens are incapable of digesting firestone and producing flame (see below); however, they do fight Thread – they fly in the lowest wing, with their riders armed with specially-designed flamethrowers to flame any Thread missed