What is interspecific competition?

• A. Two members of the same species fight for same resources
• B. Two members of different species fight for same resources
• C. They never interact
• D. One species always dominates

Answer: (B)

Inter-specific competition is when individuals from different species compete for the same limited resources, such as food, space, or light. Because those resources are finite, the overlapping needs of two species can limit growth, survival, or reproduction for both. This pressure can push species to shift where they live or what they eat, leading to solutions like niche differentiation that allow coexistence, or in some cases exclusion if one species consistently outcompetes the other.

For example, two different bird species that eat the same type of insects in the same tree will compete for those insects. In contrast, competition occurring within a single species is called intraspecific competition. The idea that they never interact isn’t accurate because competition is defined by this interaction over shared resources. Likewise, one species always dominating isn’t a universal rule; the outcome depends on the specific resources, the environment, and how each species can adapt or partition those resources.