Elevated levels of homocysteine in the blood appear to increase the risk of heart attack, stroke, peripheral vascular disease, and venous thrombo'embolism (blood clots in the veins). Homocysteine is believed to damage blood vessels in several ways.
I don't know for sure about how long Wrens usually spend on the nest at one sitting.. (Sorry couldn't resist the joke) However, the eggs usually hatch in 13-18 days, so if there were no hatchlings when that time elapsed, then you'd know for sure that she hadn't been behaving normally.
How long does it take for a caterpillar egg to hatch? Usually between 3-5 days depending on the temperature and other existing environmental conditions in which the egg resides.t take approximately 35-40 days from the time the last egg in a clutch is laid. In cooler weather it may take the longer time. In the U.S. Black Swans may nest twice a year once in September and again in late February early March. In cold weather the tiny cygnets will need shelter and supplemental food.