Deer in our friend's back yard

I saw a deer outside when we were talking to our friend and she said they are so used to people that I could go outside. I went out and slowly went towards it with my iPhone. It finally gave a snort and ran away. I need a camera with a telephoto lens! It is not good for gardens when the deer are this used to people. They will go right up to the flowers in your windowbox and eat them!