Your post almost reads like a poem, CJane, especially that second paragraph!
I saw a thing on Animal Planet about platapus bites, or stings, or quills or whatever those weird animals do, and the doctors who treat, or more likely autopsy, the bitees.
Cocoon type things? That sounds more like a preserved insect. The egg sacks I'v seen (black widow) are little spherical things, about 1/8" diameter.
Oh yes, we do have widows around here. This is about the time of year they start looking for a roof over their heads. I'm fairly tolerant, but not my roof. Not widows, I mean. The others are okay.