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Gray fox. Susan Young, Public Domain

invasive

Gray Fox

Mammal - Urocyon cinereoargenteus

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Colorado Parks and Wildlife releases gray wolf onto public land in Grand County, Colorado on Monday, December 18, 2023.

invasive

Federally Endangered, Federally Threatened, State Endangered, State Threatened, State Special Concern

Gray Wolf

Mammal - Canis lupus

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grayling (arctic) illustration by Joseph R. Tomelleri.

invasive

Grayling (Arctic)

Fish -

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Great Basin Spadefoot, NPS

invasive

Great Basin Spadefoot

Amphibian - Spea intermontana

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invasive

Great Horned Owl

Bird - Bubo virginianus

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Great Plains Rat Snake, NPS

invasive

Great Plains Ratsnake

Reptile - Pantherophis emoryi

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Great Plains Skink, Gary Stolz, FWS

invasive

Great Plains Skink

Reptile - Plestiodon (Eumeces) obsoletus

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Great Plains Toad, NPS

invasive

Great Plains Toad

Amphibian - Bufo cognatus, Anaxyrus cognatus

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Greater prairie-chicken, Wayne D. Lewis

invasive

Greater Prairie-Chicken

Bird - Tympanuchus cupido

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Greater Sage Grouse, Wayne D. Lewis

invasive

State Special Concern

Greater Sage-Grouse

Bird - Centrocercus urophasianus

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Green Sunfish

invasive

Green Sunfish

Fish - Lepomis cyanellus

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Green Toad, Cecelia Alexander, PD

invasive

Green Toad

Amphibian - Bufo debilis, Anaxyrus debilis

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Greenback Cutthroat Trout. (c) Joseph R Tomelleri

invasive

Federally Threatened, State Threatened

Greenback Cutthroat Trout

Fish - Oncorhynchus clarkii ssp

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Kevyn Jalone/NPS

invasive

Federally Threatened, State Endangered

Grizzly Bear

Mammal - Ursus arctos

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Gunnison sage-grouse, Gary Kramer, USFWS, PD

invasive

Federally Threatened, State Endangered

Gunnison Sage-Grouse

Bird - Centrocerus minimus

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