Want a shark selfie? Or a snapshot of your kid riding a wild moose?

As tourists fan out into the wilderness on summer vacations, the temptation may be there to get up close and personal with wild animals. But such interactions can have lethal consequences for man and beast.

Two tourists were gored by bison while taking pictures in Yellowstone National Park just in the past month, and a woman was killed by a lion in South Africa this week while shooting photos from inside a vehicle.

The incidents are reminders that people need to always remain “incredibly respectful of wildlife,” says National Geographic wildlife photographer Paul Nicklen, who has documented the world’s top predators, from polar bears in Greenland