No, hummingbirds are not herbivores. They are primarily insectivores and nectarivores. While they feed on the nectar of various flowers, which is plant-based, their diet also consists of insects and spiders. These protein sources are essential for their growth and reproductive needs.
Nectar provides hummingbirds with the sugars they need for energy, especially during their rapid flight. However, without the protein found in insects, they cannot maintain their health. Therefore, their diet is a combination of nectar and small invertebrates rather than purely herbivorous like some other bird species.