Desert bighorn sheep (Ovis canadensis nelsoni). Grand Canyon National Park, Arizona, USA.

Desert bighorn sheep (Ovis canadensis nelsoni), a few miles upstream of Lava Falls. 31 years after I last rafted the Grand Canyon in 1990, I noticed lots more (dozens of) native bighorn sheep in 2021, a healthy sign for this fascinating ecosystem, which is gradually recovering since nonnative wild burros were removed in the 1960s. Since Glen Canyon Dam was completed in 1966, floods no longer scour the vegetation or deposit as much sand on the diminishing beaches (which affects rafters). Aggressive nonnative species such as tamarisk trees continue to threaten native riparian biodiversity. Day 13 of 16 days rafting 226 miles down the Colorado River in Grand Canyon National Park, Arizona, USA.

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Filename: 2103SW-B1249.jpg
Copyright: © Tom Dempsey / PhotoSeek.com
Image Size: 3366x2244 / 3.6MB; http://www.photoseek.com/; Animalia Mammalia animal desert mammals nature recreation sports vertebrate wildlife
Contained in galleries: 2021 Apr 3-18: rafting Grand Canyon, AZ, Arizona: Grand Canyon National Park

Desert bighorn sheep (Ovis canadensis nelsoni), a few miles upstream of Lava Falls. 31 years after I last rafted the Grand Canyon in 1990, I noticed lots more (dozens of) native bighorn sheep in 2021, a healthy sign for this fascinating ecosystem, which is gradually recovering since nonnative wild burros were removed in the 1960s. Since Glen Canyon Dam was completed in 1966, floods no longer scour the vegetation or deposit as much sand on the diminishing beaches (which affects rafters). Aggressive nonnative species such as tamarisk trees continue to threaten native riparian biodiversity. Day 13 of 16 days rafting 226 miles down the Colorado River in Grand Canyon National Park, Arizona, USA.