The tragopans ("Tragopan"), mikado pheasant ("Syrmaticus mikado"), and several species of grouse and ptarmigan are exceptional in their largely vegetarian and arboreal foraging habitats; grouse are especially notable for being able to feed on plants rich in terpenes and quinones – such as sagebrush or conifers –, which are often avoided by other herbivores. Many species of moderate altitudes—for example the long-tailed pheasants of the genus "Syrmaticus"—also find a great deal of their daily nutritional requirements in the tree canopies, especially during the snowy and rainy periods when foraging on the ground is dangerous and less than fruitful for a variety of reasons. Although members of the genus "Syrmaticus" are capable of subsisting almost entirely on vegetarian materials for months at a time, this is not true for many of the subtropical genera. For example, the great argus ("Argusianus argus") and crested argus may do most of their foraging during rainy months in the canopy of the jungle, as well. There they are known to forage on slugs, snails, ants, and amphibians to the exclusion of plant material. How they forage in the forest canopy during the rainy months is unknown.