What better day to go on a ranger-led tour of birding sites in Grand Teton or Yellowstone national parks than on International Migratory Bird Day?

Talk about whether search-and-rescue subjects should be charged by their rescuers is getting a lot of attention lately. On Friday, ABC TV's 20/20 will raise that question.

It's been a tough week or so for hikers, mule riders and rescue teams at Grand Canyon National Park. During a 6-day span, a hiker fell off a trail and a rider was injured in an accident on a mule trip. Both required rescue via a park helicopter.

In a field that often employs paint brushes and dental picks to unlock fossils from their encasing rock, you'd think explosives would be the last tool paleontologists at Dinosaur National Monument would reach for. But, actually, it can come in quite handy when you have hundreds of tons of overburden to remove.