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.
1 Spiny-tail Iguana (Black Iguana) - Ctenosaura spp. 2  Spiny-tail Iguanas require more protein than the Green Iguana, they will eat such things as raw meat, rodents, insects, and raw eggs. 3  They are found in Mexico south to the Panama.4  Desert Iguana-Dipsosaurus dorsalis.hough a young Iguana can be started in a 10 gallon glass terrarium they will grow but soon need a much larger home. A 20 to 30 gallon glass terrarium works up through the 2nd year and a 40 to 100 gallon glass terrarium up to adulthood. A full grown Green Iguana would need a minimum size home that is 5' x 5' x 3'.