Sheep are likely to be more intelligent than generally regarded. They respond readily to food calls, may problem solve, learn their names, carry packs, and can even be clicker trained. Sheep may be grazed on open, unfenced areas and may heft (remain in home field) to a limited area as a learned behavior by lambs from their ewes. Sheep possess specialized neural mechanisms in the right temporal and frontal lobes of the brain and may recognize familiar human or ovine faces for as long as 2 yr.