When photographing animals I cannot stress enough not to get too close. I've seen many people get hurt by not following National Parks Rules and Regulations. These rules are there for you as well as the National Park Animals safety. Keep in mind when a animal hurts a human in the parks the animals sometime will be destroyed. No one wants that memory for a vacation trip scrapbook. Also, to break National Park Rules and Regs it is a Federal Offense and you may have to attend Federal Court .Another not so favorable memory for your scrapbook. :)
So here are a few Park Rules that may help:
1. Parks require a 25 yards distance from all wildlife except for Bears and Wolves which is 100 yards. ALL ANIMALS ARE UNPREDICTABLE so DO NOT APPROACH WILDLIFE. Take a long lens and you'll get a photo of a wild animal doing what he/she does naturally in the wild. They are so fun to watch because their gestures are entertaining and sometimes funny. 2. PAY ATTENTION !! To what is front and back of you at all times. The photo on the of this page is of a group of people WAY TO CLOSE to a Griz but what they didn't realize was there was a 500lb+ Buffalo right behind them. I was a 100 yards away (Park Regs.) and they were about 20 yards away from that Griz. Bad situation for all.