Flamingos in large flocks in the wild are social and extremely loyal. They perform group mating dances. Parents are very fond of their chicks, gathering them into creches for protection while both males and females fly off to search for food.

Which among the following is the most logical corollary to the above passage ?

The correct option is: "Social behaviour in some species of birds increases the odds of survival in an unsafe world."

Let us break down the logical reasoning step-by-step to understand why this option is the most logical corollary to the passage:
1. Analyze the Passage: The passage describes specific traits and behaviors of flamingos in the wild. It highlights that they are "social", perform "group mating dances", and gather their chicks into "creches for protection" while parents search for food.
2. Identify Key Themes: The central theme is the connection between "social behaviour" (flocking, group dancing, forming creches) and "protection/survival" (keeping chicks safe from threats while parents are away).
3. Evaluate the Options:
- Option 1 ("Mass nesting in all species...") and Option 4 ("All species of birds set up creches...") make overly broad generalizations about "all species of birds". The passage only provides information about flamingos (a specific species), so we cannot logically conclude a rule for all birds.
- Option 2 ("Only birds have the capacity...") is also incorrect because it claims "only" birds can develop social behavior, which is false and unsupported by the text.
- Option 3 ("Social behaviour in some species of birds...") perfectly matches the passage. Flamingos represent "some species of birds" that exhibit "social behaviour" (flocking and creches), which directly serves to protect their chicks, thereby "increasing the odds of survival in an unsafe world."