A bilateral gynandromorph is an organism that exhibits both male and female physical characteristics, typically split down the middle. This condition occurs due to an error during cell division early in development, resulting in one side of the body having male traits and the other side having female traits. This phenomenon can be observed in various species, including birds, insects, and crustaceans. Bilateral gynandromorphs are often studied in the fields of genetics and evolutionary biology to understand the mechanisms of sexual differentiation and the implications for species diversity.