Greetings,
Well I caught my Widow in the act of constructing an egg sac so I brought out the digital video camera and compressed the two hour process into two minutes of video. I am likely not too far off in believing this may be the only footage of a Black Widow constructing an egg sac (when you take into account how small the probability of people keeping fertilised Widows in captivity, coupled with the freak occurence that she started construction while I was watching her and I just happened to have my camera and tripod handy).
Anyway, click the link and it should stream for you, and turn up the volume (it has a soundtrack):
Egg Sac
Ryan
P.S. You'll notice that she lost a tiny bit of her eggs, as such I am letting this egg sac hatch out because there should only be about 50 eggs in there.
Edit: if it won't stream, go
here and save the video to your hard drive..... enjoy!