What happens when you skip mowing the lawn for one week?

I am so excited! I didn't mow my lawn for one or two weeks in the backyard and this was for the benefit of the lightning bugs or fireflies. I gave in and started mowing today -I gave into social pressure. Anyway, what I noticed in my backyard was a sprouted oak tree. a white swamp oak?. I do get deer in my backyard so I will have to fence it in with some chicken wire. A good deed was rewarded afterall. I thank the squirrels for their contribution.