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 a black bird egg?   10-19 days i think!!!!!!! and then a further 10-19 days before the chick becomes a fledgling.he length of time it takes baby birds to hatch varies widely from species to species. Some emerge from the egg immediately, while others can take hours.