Board Thread:Questions and Answers/@comment-26288110-20150528185352/@comment-4560646-20150601000432

I'm not in the mood to do a screenshot montage, but I can tell you've made an error:

You need to keep the tail touching the ground, then add a limb. Keep it sort of like you did, but make the joints further away from its connection to the tail.

Now, mouse over the joint that is connected to the tail, and increase it to the largest size available. Select it, and drag it the furthest it can get from the tail without disconnecting. Once you found such position, shrink the joint into the smallest size. Ta-da, you have an invisible limb!