Invasive Species
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The New Zealand Mudsnail has recently began spreading rapidly across the western United States. This snail was first discovered in Idaho during the 1980's and now it has made an appearance in rivers located in three national parks, including the Grand Canyon. New Zealand Mudsnail populations can become extremely dense. Populations can reach over one hundred thousand snails per square meter! This species is considered an invasive species in the Grand Canyon because it alters primary production and native invertebrate populations in the Colorado River. In the future, these snails could have a major impact on aquatic ecosystems in the western United States.
Endangered Species
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The Humpback Chub is an endangered species found in Grand Canyon National Park. The Humpback Chub is a member of the minnow (fish) family. This fish has a distinct appearance with an abrupt hump behind its head. It can vary from green to silver and it can grow to be eighteen inches long. They can be found in deep, fast-moving rivers located near canyons (mainly the Colorado River). This fish feeds primarily on small aquatic insects and algae. The building of dams and other water diversion projects have caused the population of Humpback Chub to decline because their migration path is blocked.