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 to hatch duck eggs? It takes 28 days for duck eggs to hatch.....and it takes 21 days for baby chicks to hatch and you can only put 12 eggs under neath a chicken.. How long does it take a crow egg to hatch? It takes them 5 to 6 days to hatch!!