Which of the following animals can help keep pasture free of worms?

Sheep are known to help keep pastures healthier by managing worm populations effectively. They graze on grass and other plants, which can help reduce the number of persistent larvae in the soil. By doing so, their grazing habits disrupt the lifecycle of parasites, ultimately leading to fewer worms in the pasture.

In contrast, while rabbits, chickens, and goats all play roles in pasture management, they do not have the same impact on worm control as sheep do. Rabbits typically don’t graze in the same way and may not consume the vegetation that harbors worms. Chickens can help by scratching the ground and eating certain insect larvae, but they are not specifically effective against the internal parasites found in other grazing animals. Goats are browsers, preferring to eat bushes and woody plants rather than grazing on grass, making their effectiveness in controlling worm populations less direct. Therefore, the choice of sheep is rooted in their specific grazing behavior that contributes to a reduction in pasture worm burdens.