I'm sure like me, many people forget what a cub's stats were when they got them, or forget to note down stats given from patrolling or food, and would like a way to track stat changes for their lions on site.

So I propose a page that displays a lion's stat history, and what stats came from where, eg:

Cub born at 215 stats
+[# stat] from [item] used/eaten at [time] on [date]
+[# stats] from aging up at [#%] training on [date]
+[# stat] from hunting/patrolling at [time] on [date]

alternately

Lion born at [#] stats

Stats Gained from Hunting/Patrolling:
+[#] speed|+[#] smarts|+[#] strength|+[#] agility|+[#] skill|+[#] stamina

Stats gained from toys:
+[#] speed|+[#] smarts|+[#] strength|+[#] agility|+[#] skill|+[#] stamina

Stats gained from food:
+[#] speed|+[#] smarts|+[#] strength|+[#] agility|+[#] skill|+[#] stamina

Misc Stat gains:
(aka gains that dont fall into those 3 categories)
+[#] speed|+[#] smarts|+[#] strength|+[#] agility|+[#] skill|+[#] stamina

It could either be only viewable by the lion's owner, or visible to everyone.

Edit: Extra Suggestion
If it'd be too data heavy to add such information to every lion, maybe have it as a toggleable option (most people will likely turn it on for their heir/king and a few key lionesses perhaps?). On the lions page click a 'turn on stat tracking for this lion' button, and from then on that lions stats are tracked and displayed in one of the ways above.

if you vote no support, let me know why!