For the next four months biologists will be trapping grizzly and black bears in Yellowstone National Park's backcountry as part of an ongoing research project to better understand the bears' populations in the Greater Yellowstone Ecosystem.
In a remarkable comeback, Razorback suckers are once again spawning in the lower Colorado River within Grand Canyon National Park, an event not seen in more than two decades, according to fisheries experts.
A black bear at Glacier National Park that developed a habit of searching out human food, in one case breaking into a house, has been put down by rangers.
The rapidity with which butterflies can reproduce has played a huge role in the ongoing recovery of endangered Schaus swallowtail butterflies at Biscayne National Park in Florida, where the species once thought to be teetering on the lip of extinction has grown by more than 1,000 individuals.
Stylish collars and perhaps a splash of paint will mark some mountain goats this summer at Glacier National Park in Montana, where an ongoing study of the animals is moving into its second year.
A rally to raise public awareness about wolves in and around Yellowstone National Park is scheduled for late June near the north entrance to the park at Gardiner, Montana.
In what would be a milestone for the California condor recovery program, biologists believe a pair of the large birds has hatched a chick high in the cliffs of Zion National Park.
The moose population at Voyageurs National Park in Minnesota seems to be holding its own, according to a recent survey conducted by park biologists. While the herd isn't growning, moose mortality rates in Voyageurs are about half of that found elsewhere in northeastern Minnesota, officials say.
Rum Island on Long Pond in Acadia National Park in Maine will be closed to the public through mid-July so you won't ruffle the feathers of loons that nest there.
Across the National Park System, groups are constantly work to improve the plight of both animals and human visitors. At Yellowstone National Park, one aspect of that effort is to install bear-proof boxes that will keep bears and campers out of each other's way. But as of today, more than 1,000 bear boxes are still needed, and the Yellowstone Park Foundation is trying to raise the money needed to close that gap.
A young grizzly bear apparently fell to its death in Glacier National Park, where it was found on the Going-to-the-Sun Road by maintenance workers.
Progress Seen In Protecting Yellowstone Cutthroat Trout From Lake Trout In Yellowstone National Park
Two decades after non-native lake trout were discovered in Yellowstone Lake, officials say they are making good progress in removing those predacious fish and protecting the lake's iconic Yellowstone cutthroat trout in Yellowstone National Park.
Within days of Yosemite National Park officials warning visitors it was illegal to fly drones in the park, volunteers at Zion National Park in Utah say they saw a drone harassing wildlife in their park.
Bears have been acrobats in circuses for generations, and watching this black bear sow and her cub at Big Bend National Park, it's obvious their talents come naturally.
Grand Teton National Park is an open-air zoo of sorts, with bison, pronghorn antelope, eagles, and other wildlife usually in view wherever you find yourself in the park. But there is one slice of Grand Teton that is more productive when it comes to spotting animals.
Officials from Badlands National Park in South Dakota are hosting open houses this week to consider a proposal to release bison on the South Unit of the national park.
A disease that afflicts sea stars has taken root in Pacific waters from Alaska down to California, including portions of Redwood National and State Parks. Biologists say this year's mass mortality tied to the disease is "unprecedented."
Timing often is happenstance, but with Earth Day arriving next week, word of high mercury levels in fish in national parks from Alaska to Colorado is particularly sobering. In some cases, the levels exceed limits OKed for human consumption.
A small number of fish released into the Colorado River within Grand Canyon National Park hopefully will turn into tattletales.
Sierra Nevada Bighorn Sheep Again Roaming Great Western Divide In Sequoia, Kings Canyon National Parks
It took the help of a helicopter, but Sierra Nevada bighorn sheep are once again roaming the Great Western Divide that forms part of the border between Kings Canyon and Sequoia national parks.
At Isle Royale National Park, where the island's wolf population has been in slow decay for years, park officials have announced plans to take a thorough look at options for preserving wolves on the landscape.
How healthy is Yellowstone National Park's moose population? That's a question a husband-and-wife team from Vermont hopes to answer over the course of a three-year study into the animals.
The bison management plan that governs how Yellowstone National Park bison are managed when they leave the park could be revised under a proposal Park Service and Montana officials are exploring.
Incubating eggs in the harsh coastal expanses of Kenai Fjords National Park and Preserve in Alaska is tough business to start with, and with predators on the prowl, it becomes even more difficult to rear a brood.
Not too many years ago there was a study that identified the type of vehicles Yosemite National Park's bears liked to break into for a meal. Now a new study says improved efforts to keep bears away from human foods has been a tremendous success in the park.
Three bison were shot and killed inside Yellowstone National Park within the last week, leading park officials Tuesday to ask the public for help in finding the person or persons responsible.
A female wolf that crossed from Isle Royale National Park to Grand Portage National Monument via an ice bridge across Lake Superior was killed by a pellet gun wound, according to veterinarians.
What looks like a crocodile and moves like a crocodile, but doesn't belong in Everglades National Park?
The annual reduction of bison from Yellowstone National Park has ended, with an estimated 600 of the iconic animals removed from the park's herds via hunting or culling.