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Thanks to climate change and the destruction of its natural habitat, the white-letter hairstreak has migrated north.
NATURE
He's calling on an "army of fourth graders" to join him.
Trackers are looking for “information leading to ... a bona fide Bigfoot."
The tree was planted in Boise more than a century ago.
A Canadian study finds that 10 extra trees per city block made people feel as healthy as if they were seven years younger.
A Denver neighborhood managed to save millions of gallons of water by replacing juniper bushes and grass with native plants that were made to survive in the high desert.
The falls are the fullest they've been in years.
Tourists looking for the perfect Instagram shot can leave damage that lasts for years.
Zoom in for an up-close look, or check to see how far the bears have traveled.
The tiny bristles are perfect for cleaning fly eggs and larva from fur.
You may remember the rock arch, called the Azure Window, from HBO's "Game of Thrones."
The water's unusual shade can be chalked up to a variety of environmental factors.
Due to warm weather, amphibians may be coming out of hibernation earlier than usual.
