Which one of the following is not form multimale bisexual group ?

Question

Accepted Answer

The correct option is 3: Patas monkey

The Patas monkey (*Erythrocebus patas*) is the correct answer because its stable, persistent social structure does *not* constitute a multimale bisexual group; rather, it is typically described as a **unimale-multifemale** group. The core, year-round social unit is composed of a single, resident adult male, multiple adult females, and their offspring. This resident male aggressively defends the group and drives off any other adult males. An excess of non-resident males either travels alone or forms separate, temporary all-male bachelor groups. It is true that during the short, seasonal mating period, outside males may temporarily join a group to mate promiscuously, creating a transient multimale structure, but the group quickly reforms into its unimale composition when the mating season ends, meaning the stable social organization is unimale, not multimale.

The incorrect option is 1: Gorilla

Gorillas are often cited for their one-male social structure led by a dominant Silverback, but multi-male troops **do** exist and are a common form of their social organization, particularly in Mountain and Western Lowland Gorilla populations. These multimale bisexual troops consist of the dominant Silverback, a number of adult females and their offspring, and one or more subordinate adult males (called Blackbacks or younger Silverbacks). The subordinate males provide supplementary defense for the group, making the troop a stable unit of multiple adult males and females living together. This permanent cohabitation and cooperation between multiple adult males and females classifies them as a multimale bisexual group.

The incorrect option is 2: Rhesus

The Rhesus macaque (*Macaca mulatta*) is a primary example of a stable, true **multimale bisexual group**, also referred to as a multi-male, multi-female society. Rhesus groups are large, often consisting of dozens of animals, and they contain numerous adult males and females that coexist permanently. The society is defined by complex social dynamics, including a rigid, linear dominance hierarchy among the females and continuous competition among the males for rank and mating access. The year-round co-residence and social organization built around the interaction of multiple individuals of both sexes confirms their placement in the multimale bisexual group category.

The incorrect option is 4: Squirrel monkey

Squirrel monkeys (*Saimiri* species) also form stable, large **multimale bisexual groups** that persist year-round. Their troops are known for their impressive size, often containing up to 50 or more individuals. Multiple adult males and multiple adult females live, travel, and forage together in this permanent group. While the males and females often form separate sub-groups within the larger troop—a "male sub-group" and a "female-juvenile sub-group"—the entire population constitutes a single, cohesive, long-term social unit. This permanent cohabitation of numerous adult individuals of both sexes clearly defines the Squirrel monkey’s society as a multimale bisexual group.