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.
When do whooping cranes lay eggs? The nesting season in Wood Buffalo National Park begins in late April or early May. In central Florida it begins in January and extends through May. How many eggs do whooping cranes lay each season? Mean clutch size, or number of eggs per nest, is 1.94 eggs. Most nests contain two eggs; occasionally, nests contain only one egg, and rarely three. How long does it take for whooping crane eggs to hatch? It takes between 29 and 31 days for the eggs to hatch. Both males and females incubate.