Which of the following interactions can be considered herbivory?

Herbivory is defined as an interaction where an organism primarily feeds on plants or plant-based material. In this context, the correct answer involves a cow grazing on grass, illustrating the relationship between an herbivore and its food source.

This relationship is characterized by the consumption of plant matter, which is fundamental to the food chain, as herbivores convert plant matter into energy they need to survive. Grazing is a typical mechanism of herbivory, showcasing how these animals utilize grass, a plant, as their primary source of nutrition.

The other interactions presented involve different types of feeding relationships. For instance, a bird feeding on a worm represents predation rather than herbivory, as birds in this context are eating other animals. Similarly, a lion hunting a zebra illustrates a predator-prey dynamic, which is distinctly different from herbivory. Finally, a snake consuming a rat also pertains to predation, as snakes are carnivorous and do not feed on plant materials. Thus, the only suitable example of herbivory among the choices is the cow grazing on grass.