Persian onager Persian Onager foals at the Wilds conservation center in Southeastern Ohio, in collaboration with experts from the Smithsonian Conservation Biology Institute. Since 2003, Persian onagers have been introduced in Saudi Arabia, where the Syrian wild ass once lived. Introduced Persian onagers live in deserts foraging on grasses and branches or woodier plant material in dry seasons. In 1968, 11 Persian and Turkmenian onagers were flown from their countries to Israel in exchange for Israeli gazelles. These were bred in captivity at the Hai Bar Yotvata wildlife sanctuary. Together, they bred a few Persian/Turkmenian hybrids in Israel. Offspring were introduced into
Type system or an "effect system", which enables even more program specifications to be verified by a type checker. Beyond simple value-type pairs, a virtual "region" of code is associated with an "effect" component describing "what" is being done "with what", and enabling for example to "throw" an error report. Thus the symbolic system may be a "type and effect system", which endows it with more safety checking than type checking alone. Whether automated by the compiler or specified by a programmer, a type system makes program behavior illegal if outside the type-system rules. Advantages provided by programmer-specified type systems include: Advantages