Species in Peril

Extirpated, endangered, and sensitive species along the Colorado River in Grand Canyon National Park*

X=Extirpated-regionally extinct
E=Endangered
C=Candidate for listing as threatened or endangered
SC=Species of concern.

FISH
Colorado pikeminnow (X)
Razorback sucker (X) Bonytail chub (X)
Roundtail chub (X)
Humpback chub (E)
Flannelmouth sucker (SC)
Bluehead sucker (SC)
Speckled dace (SC)

AMPHIBIANS
Relict leopard frog (C)
Northern leopard frog (C)

REPTILES
Zebra-tailed lizard (SC)
Desert banded gecko (SC)

BIRDS
Yuma clapper rail (E)
Southwestern willow flycatcher (E)
Yellow-billed cuckoo (C)

MAMMALS
Southwest river otter (X)
Muskrat (X)
Long-legged myotis bat (SC)
Western red bat (SC)
Spotted bat (SC)
Pale Townsend's big-eared bat (SC)
Allen's big-eared bat (SC)
Greater Western mastiff bat (SC)

INVERTEBRATES
Pre-dam insect assemblage
Kanab ambersnail (E)

PLANTS
Old high water zone assemblage

*Studies show that many of these species are seriously impacted by the presence of the dam. However, a lack of pre-dam population data on some species makes it necessary to base judgements solely on current knowledge of habitat requirements.