Cases of a 2-day-old Simmental calf (no hyperinsulinism) [365], young Beagle dogs (no hyperinsulinism) [366], a 6-year-old castrated male Australian Shepherd (hyperinsulinemic hypoglycemia) [367], old dogs (some with hypoglycemia and/or hyperinsulinism) [368], two squirrel monkeys (hyperglycemia with glucagon-reactive nesidioblastosis) [369], a cat (hyperinsulinemic hypoglycemia) [370], and several aged horses (no documented hyperinsulinism) [371] were found in the literature. The gene discussed is GCG; the disease is hyperinsulinemic hypoglycemia.