It starts similarly to toe-up socks; it’s got a lot of slipped stitches (both knitwise and purlwise); and at the end you have to do a tiny bit of crocheting. The resulting trilobite is about 3 inches long, depending on the size of yarn and needles you choose. I recommend worsted-weight yarn at a tight gauge, say size US#4 needles. The needles should be double-pointed sock needles. You’ll also want a crochet hook in a similar size, a yarn needle, some stuffing, and eyes.
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