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.
Your iguana will starve to death on a steady diet of iceberg lettuce. Baby iguanas need to eat twice each day. Their food should be chopped finely, and mixed well. As they get older, they can eat coarsely chopped leaves, and will only need to be fed once a day. Adults (over 3 years old) only need to be fed every other day.