If the sub-category page does not already exist, then you have to create it first (see the tip How to create a category). For example, after you create the Category:Apes by common name page, then you click edit and add [[Category:Animals by common name]] to the bottom of it.
Thanks for going through all the userboxes! If you really looked at and read every single thing in my userpage. Thats very good! You are either obsessed with me or have way too much time on your hands!! Happy Editing!!!;)
Committed identity: 3cf8356f0d2d758a33f73fe994f786ac0d07c5175a5bac13881c27aa1c85e6e2 is a SHA-256commitment to this user's real-life identity.
Wikipedia editor
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