Communication and Perception
As mentioned before, a female saker will make a “chip” noise to prompt her young to open their beaks for food, and they will chirp to get a parent’s attention. Male sakers call during their aerial displays in order to attract or impress a female, and if the female accepts the male, she may join in the calling at the end. Sakers may often call aggressively to drive off intruders from the nest or a freshly killed meal.
Sakers, like other falcons, communicate fairly often by posturing. The most aggressive display is the Upright Threat; the bird stands up straight, spreads its wings and fluffs out its facial feathers, hisses, cackles, and strikes with the feet. This display is used by adult falcons in defense of the young, and by feathered nestlings against nest intruders. Sakers also use bowing to appease a mate, and communicate submission with a modified version of bowing, in which the beak is pointed to the side.
Communication Channels: visual ; tactile ; acoustic
Other Communication Modes: duets
Perception Channels: ultraviolet