When this happens, the thyroid gland is no longer under pituitary control. The amount of hormone it produces is dependent on levels of TSI. TSI are the direct cause of hyperthyroidism in Gravesâ disease and various immune system chemicals known as cytokines also contribute to the symptoms that occur in this disorder.
Iguanas are reptiles and nearly all reptiles lay eggs. There are some reptiles that do not lay eggs, but they are very rare. Female iguanas usually lay a clutch of eggs every year once they're mature. If there is no male iguana, she will still lay eggs, but they won't be fertile.
Most mating and egg laying is in late winter or early spring. The male will bite her on the back of the neck, line up their vents and will mate with the female. The leopard gecko eggs will develop in pairs. As the eggs grow you will notice her gain weight and can possibly see the eggs through the belly skin.