Definition: "Aphototaxis" refers to a phenomenon where a bird or animal flies in a straight line for a brief period, often with little change in speed or direction; this action could be seen as an extension of its own flight. The term "aphototaxis" originates from the Greek word "apรณ", which means "in a straight line." This term was used to describe the movement of birds and insects that are primarily adapted for flying horizontally, like butterflies, moths, and bees.