are highly selective grazers, choosing only a few plant genera. Dandelion (Taraxacum spp.), legumes (Fabaceae), yarrow (Achillea spp.) and wild lettuce (Lactuca spp.) account for most of their forb intake. From July to September, dandelion comprised 45% of forb intake; sagebrush comprised 34%. Collectively, dandelion, sagebrush, and two legume genera (Trifolium and Astragalus) contributed more than 90% of the greater sage-grouse diet. Insects are a minor diet item for adults. Insects comprised 2% of the adult diet in spring and fall and 9% in summer. Sagebrush made up 71% of the year-round diet. Females before laying Herbaceous dicots are used heavily by females before egg laying and may be essential for their nutrition because of their high protein and nutrient content. Favored foods of prelaying and brood-rearing greater sage-grouse hens in Oregon are common dandelion (Taraxacum officinale), goatsbeard (Tragopogon dubius), western yarrow (Achillea millefolium), prickly lettuce (Lactuca serriola), and sego lily (Calochortus macrocarpus). Juveniles In their first week of life, greater sage-grouse chicks consume primarily insects, especially ants and beetles. Their diet then switches to forbs, with sagebrush gradually assuming primary importance. In a Utah study, forbs composed 54 to 60% of the summer diet of juveniles, while the diet of adult birds was 39 to 47% forbs. A Wyoming study evaluated effects of eliminating insects from the diet of newly hatched greater sage-grouse chicks. All chicks hatched in captivity and not provided insects died between the ages of 4 and 10 days, whereas all chicks fed insects survived the first 10 days. Captive chicks required insects for survival until they were at least three weeks old. Chicks more than three weeks old survived without insects, but their growth rates were lowered significantly, indicating insects were still required for normal growth after three weeks of age. As quantity of insects in the diet increased, survival and growth rates also increased up to 45 days, the length of the experiment. In a study conducted in Idaho, Klebenow and Gray measured food items for juvenile greater sage-grouse for each age class, classes being defined by weeks since birth. In the first week, insects were very important – 52% of the total diet. Beetles, primarily family Scarabaeidae, were the main food item. Beetles were taken by all other age classes of chicks, but in smaller amounts. All ages fed upon ants, and while the volume was generally low, ants were found in most