When the caterpillar is ready to change into a chrysalis, it climbs to the top of the habitat. First it crawls around a bit, laying a trail of silk everywhere it goes. Once it choose a spot, it makes a button of silk which will end up attaching it to the roof for the next 12 to 14 days. Here you can see one chrysalis attached by its button and one caterpillar which has made the button, then carefully placed its butt right on it. Unlike spiders, the Monarch caterpillar's spinneret is located on the side of its mouth. I have seen the silk button show up under the head, then later the middle, then finally on the butt as shown here. Once attached, it is extremely strong since in the wild, it has to withstand high winds and storms. When researching, on several places on the internet, I found this statement: "Silk is one of the strongest natural fibers – it’s said that pound for pound, silk is stronger than steel."
Monarch Caterpillar (Danaus plexippus)
Monarch Chrysalis(Danaus plexippus)
chrysalismonarchdanaus plexippusMetamorphosisnew lifeendangeredbutterfly habitatgarland texaschangesilksilk buttonattaching
From Monarch Life Cycle