👉 Terdiurnal refers to a phenomenon where an animal changes its behavior in response to changing conditions. For example, if a bird flies from one side of its nest to another during the day and then flies back to its nest at night, it is said to be in terdiurnal mode. In this context, "tertiary" means higher or more distant than primary, so when a bird flies from one side of its nest to another during the day and then flies back to its nest at
