This is a receptor for VIP. The activity of this receptor is mediated by G proteins which activate adenylyl cyclase. Expressed in pituitary, hypothalamus, small intestine and ovarian follicles. Pituitary levels are highest in non-photostimulated and incubating birds and lower in photostimulated, laying and photorefractory birds. Pituitary levels decrease on VIP immunization. Belongs to the G-protein coupled receptor 2 family.