I've actually controlled more squirrels than that before...
Four [i]Acorn Catapults[/i], [i]Stuffy Doll[/i] targeting me, and [i]Platinum Emperion[/i]... And one more card...
Launch Acorns at Stuffy, Stuffy then damages me, Platinum makes it so my life total doesn't change. Gain a squirel for every acorn launched. Then the one card I can't remember doubles the amount of squirrels as I gain them, for a max of 8 per turn.
That was a long game... MTG at it's finest.
And as I'm thinking about it... Coat of Arms. Each creature gets +1/+1 for EACH other creature that shares a type with it... That would make for some beastly squirrels.
Edit: Not sure as to why this was a reply to your comment. Stupid app...