In a grassland ecosystem, green plants or grasses are producers.
Herbivores feed on grasses.
Examples of herbivores include deer, rabbits, and grasshoppers.
Carnivores feed on herbivores.
At the top of the food chain, the consumers are usually carnivores.
They occupy the higher trophic level.
Bacteria are decomposers, not top consumers.
Herbivores are primary consumers, not top consumers.
Therefore, in a grassland ecosystem, the top consumers are:
\[
\text{Carnivorous}.
\]