Q.Assertion (A) : A cattle egret and grazing cattle in close association is a classic example of commensalism. Reason (R) : As grazing cattle move through the field, they stir up and flush out insects from the vegetation that otherwise might be difficult for egrets to find and catch.
You're viewing a preview — the full solution, concept, methods & PYQ mapping are locked.
Start your 14-day free trial to unlock the full solution →The interaction between cattle egrets and grazing cattle is a classic example of commensalism, where the egret benefits by feeding on insects disturbed by the cattle, while the cattle remain unaffected.
In the intricate web of ecological interactions, organisms often form relationships that can be beneficial, harmful, or neutral to one another. One such fascinating relationship is commensalism, a type of interspecific interaction where one species benefits, while the other species is neither harmed nor benefited. It's a 'win-neutral' scenario, distinct from mutualism (where both benefit) or parasitism (where one benefits at the expense of the other).
The association between a cattle egret and grazing cattle perfectly illustrates this concept. You might have often observed these white birds perched on the backs of cattle or foraging close by as the cattle graze in fields. This isn't a coincidence; it's a strategic partnership from the egret's perspective.
-
The Cattle Egret's Benefit: The egret, being an insectivorous bird, primarily feeds on insects. When cattle move through grasslands, their large bodies and hooves disturb the vegetation. This disturbance flushes out insects that were previously hidden or difficult for the egret to spot and catch on its own. The cattle essentially act as mobile 'beaters,' making the egret's hunting much easier and more efficient. The egret expends less energy in finding food, thereby gaining a significant advantage.
-
The Cattle's Role: For the cattle, this interaction is largely neutral. Their primary activity is grazing, and whether egrets are present or not, their movement through the field is part of their natural foraging behavior. The stirring up of insects does not provide any discernible benefit or harm to the cattle. They are neither losing food, nor gaining protection, nor expending extra energy because of the egrets. …
Unlock everything free for 14 days
- Full step-by-step solutions
- Concept-first explanations
- Methods, shortcuts & mistakes
- PYQ mapping + timed mock tests
Full access for 14 days. No credit card required.