If you have ever lived in a suburban neighborhood or out in the farmlands, you likely have noticed a whitetail deer or two roaming around during an autumn evening. It doesn’t really catch you off guard; after all, it’s a deer and deer are everywhere. A year later, you look out your living room window and see four or five deer, the next autumn there are 10, and the next, 15. What’s going on? Where are all these deer coming from? Well, the answer has to do with what biologists refer to as population growth curves.