I have a "cave spider"...also called tail-less whip scorpion, or amblypidgid that I have owned for about two years now. He first molted over a year and a half ago, and I came in to think there were two spiders for a minute as his molt was sitting there looking like a complete critter.
Well, last night he gave me an even greater startle. I went into bed, was reading a book, and rolled over to turn out the lights...and was greeted by this:
Aaahhhhh.....it's a Facehugger!
He was molting, and I'd never seen a creature with an exoskeleton actually in the process of molting before...he was white and clearish, rubbery and limp-looking, and I thought he was dead until he started slowly pulling his legs and antennae free....
This morning he was sucking down water from his dish- probably thoroughly exhausted from all that effort. He's back to his usual brown mottled coloration, and when I get home I am going to compare his new size to his molt, which is still hanging off the screen lid of his cage.