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.
Confidence votes 20. Female Iguanas will lay eggs when they become sexually mature, which is around 1.5 to 2 years old. They do not need to be fertilized to lay so therefore do not need a male Iguana. They need to be healthy before they lay or else there can be very serious problems.
A kiwi lays one large egg (about six times the size of an egg from another bird of the same size) then, 24 days later, lays another egg. The second egg is beginning to developâ¦ as soon as the first is laid. On rare occasions, a kiwi may lay a third egg.