All you can eat offspring...

Seriously...At the zoo pictured, this tigress lost her litter of cubs to illness. She stopped eating, stopped moving -- depressed and grieving. Afraid they were going to lose her, zoologists took a litter of common barnyards piglets, dressed them in tiger sweaters and gave them to their new mama...

So, I hate to say it, but how long until mama realizes she raised her own dinner?