Using worsted weight yarn and a G hook, the finished product will be about 3" tall, with legs that can engulf prey up to 9" in diameter.
For sale is an original two page pdf pattern, which will be available for direct download from Etsy.
The pattern assumes you know (or are willing to google) some basic (American notation) crochet stitches - single, double, slip, increase, decrease, etc. It does NOT, however, assume you like to decipher tricky code, so it's written out in long form, and I explain why certain stitches are called for at different times.
If you've got basic crochet skills, this project can be made in a leisurely evening. However, it's more complicated than others in the Wunderkammer.