Can you explain what you mean by DON'T being always and DO not? If DON'T is definitive, why would DO not be? I don't understand that part.
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Back to the lions...
If you are going to make a statement about lions, you can't eliminate the part of their living situation that doesn't fit your equation.
There may be less male lions overall since they have to fend for themselves, and consequently, unless they form a bond with another male lion, do not have the extra safety and food afforded by a male with a pride BUT pride-free lions are part and parcel of the overall lion existance, and pride-free lions don't share, so you can't say lions do share. You can say lions sometimes share, or lions most often share, but not that they DO and make it sound like it is an all-the-time thing.
If you insist on using the word do, then you have to add a modifier.
