Beehives take up little space on the land, but, like other livestock, bees need space to roam, and they need a varied diet. Beekeeper Melanie Kirby is a "landless farmer," who sets up her beehives on farms and ranches, where the bees can thrive and the agrarians can take advantage of their pollination services. In fact pollination services have become essential to American agriculture, as monocrop farms don't provide sufficient habitat for pollinators to thrive, so beekeepers actually ship bees by the pallet seasonally to sites when trees and other crops are in bloom. In 2008 the income from pollination services exceeded the price of honey, which shifted the business model for beekeepers, especially at the large scale. Among the many challenges for beekeepers are pesticide use, which threaten bees and in turn the foods that rely on them. Kirby is involved in helping to create pollinator protection policies to spread awareness and safeguard these essential constituents of the food system.