In this food web, the grasshopper and the mouse have this relationship:
9 answers
The grasshopper is a primary consumer that eats grass, while the mouse is a secondary consumer that eats the grasshopper. Therefore, the relationship between the grasshopper and the mouse is predator-prey.
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A bison walks through the grass, insects fly up and are seen and eaten by egrets. This neither harms nor helps the bison, but it is easier for the egrets to get food.
The relationship between the bison, insects, and egrets can be described as a "commensalism" relationship. Commensalism is a type of interspecific interaction whereby one species benefits, and the other is neither benefited nor harmed. In this case, the bison and the insects have no direct interaction with each other. However, when the bison walks through the grass, insects fly up and are then seen and eaten by egrets. The insects, by flying up, provide an opportunity for the egrets to feed easily, while the bison is not affected either positively or negatively by this interaction.