A tiny scorpion-like invertebrate found only in Grand Canyon National Park is among 67 plant, animal, and insect species that the U.S. Fish and Wildlife Service says might be eligible for listing as a threatened or endangered species under the Endangered Species Act.

A buildup of ice on the tracks was blamed for partially derailing a locomotive pulling a passenger train to Grand Canyon National Park. No one was hurt in the incident, and buses were summoned to take the 70 passengers the rest of the way to the park's station.

For most, a national park vacation entails booking a room in a lodge or reserving a spot in a campground, arriving at the park and checking in, and then spending a number of days hiking, paddling, or traveling the park to view various sites, whether they focus on waterfalls, geysers, deep forests, museums, or cultural focal points. Here are some alternatives to that approach, some pricey, some not so.

Interior Secretary Ken Salazar is calling for more high-flow releases of the Colorado River down through Grand Canyon National Park and believes they can be done to benefit the national park's resources while also meeting energy and water needs.