Similarly, the work of Violant i Simorra (1949) brought to light the wealth of both Aragonese and Catalan migratory herding in the Pyrenees mountains.
The Interior of the park (7,991 km2) is higher in elevation (>2,500 m), receives higher annual snowfall, and generally supports lower densities of wolves and ungulates, with the exception of a large migratory herd of bison (Bison bison).
We have the largest migratory herds of wildlife in North America.
The lack of adequate grazing land and intensified cultivation will mean that settling migratory herds, at least in the short-term, will necessitate a greater use of intensive housing.
Delfina, one of our sources in Pina de Montalgrao, a village of Castellón which borders with Teruel and is steeped in migratory herding history, said: 'a shepherd suffered great hardship, but had relief in being the first to worship Baby Jesus'.
Couzin pointed to the role that "leaders" play in the sudden movements of schools of fish, or in migratory herds of animals: only a few of the animals possess the necessary information about where to go, but the others spontaneously follow them.
The grasslands of Tanzania and Kenya are renowned for their wildlife, in particular large migratory herds of ungulates (e.g., gnus, zebras, and gazelles) and predators (lions, hyenas, and leopards).
Livestock raising has been the mainstay of much of the region; migratory herding of sheep from mountain pastures in the Abruzzi to lowland winter pastures outside of the region continues, although on a decreasing scale.
In Burkina Faso, livestock are an important part of the economy, and migratory herding is a more resilient means of raising cattle, adapted to the local environment.
Nomadic customs and institutions thus superimposed fragile political structures on the migratory herding of small kinship groups.
