The term that describes the ecological relationship between deer and grass is ‘herbivory’.
Herbivory refers to the interaction where herbivores, such as deer, consume plant material, like grass. This relationship is a fundamental aspect of many ecosystems, as it helps to shape plant communities, influences species diversity, and impacts the overall health of the environment.
In this context, deer derive their nutrition from grazing on grass, which can affect the growth and distribution of the grass populations. While this relationship benefits the deer as a food resource, it can also present challenges for the grass if deer populations are too high, leading to overgrazing and potential ecological imbalances.