Mammal

Bighorn Sheep

Ovis canadensis
Mammal Missouri River Breaks, near present-day Fort Peck, Montana New to Western Science
Bighorn Sheep

Photo: Jakub Frys, CC BY-SA 4.0

Common Names
Bighorn / Mountain Ram
Habitat
S of Yellowstone Confluence
Conservation
Extinct
First Observed
1805-04-26
Observed At
Missouri River Breaks, near present-day Fort Peck, Montana

Audubon bighorn of Plains once thought a different species, or subspecies of mountain bighorn, now seen as extinct race.

Recent sightings

Where it’s being seen today

8 research-grade iNaturalist observations between 2013–2025. Most recent: 2025-06-04. Sourced from Terrain360 trail captures, cached locally.

Journal References

15 journal entries mention Bighorn Sheep

Apr 26 1805
Lewis: April 26, 1805
Friday April 26th 1805. This morning I dispatched Joseph Fields up the yellowstone river with orders to examine it as far as he could conveniently...
Apr 29 1805
Patrick Gass: April 29, 1805
...er seen, and on the top of the highest we saw some Mountain sheep, which the natives say are common about the Rocky mountains. These were the first we had seen and w...
May 25 1805
Lewis: May 25, 1805
...d small, the iris of a silvery colour much like the common sheep; the bone above the eye is remarkably prominant; the head nostrils and division of the upper lip ...
May 25 1805
Missouri River near Musselshell River — Patrick Gass: May 25, 1805
...killed three of what the French and natives call moun- tain sheep; but they very little resemble sheep, except in the head, horns and feet. They are of a dun colour ...
May 26 1805
Patrick Gass: May 26, 1805
...s. We saw few animals of any kind, but the Ibex or mountain sheep. One of our men killed a male, which had horns two feet long and four inches diameter at the root.*...
May 27 1805
Missouri River, first view of Rocky Mountains — Patrick Gass: May 27, 1805
...bservations respecting the country we have passed. the real sheep in its wild and savage state. Perhaps it may be found to be exactly the same: of which we find the ...
May 31 1805
Lewis: May 31, 1805
...anamals resort much to lodg, have the peculiar smell of the sheepfolds. the party killed in addition to our hunt 2 buffaloe and an Elk. the river today has been fr...
May 31 1805
Missouri River, first view of Rocky Mountains — Joseph Whitehouse: May 31, 1805
...in at dark had killed 1 black taild Deer 2 Ibex or mountain Sheep (rams) which had handsom large horns. we took care of the horns in order to take them back to the U...
Jun 1 1805
Missouri River near Marias River approach — Patrick Gass: June 1, 1805
...lands covered with cotton wood. We saw a number of mountain sheep. Yesterday our men killed three of them, that had remarkable large horns; one pair weighed 25 pound...
Jul 17 1805
Lewis: July 17, 1805
Wednesday July 17th 1805. The sunflower is in bloom and abundant in the river bottoms. The Indians of the Missouri particularly those who do not...
Jul 17 1805
Missouri River above Great Falls, Gates of the Mountains — Patrick Gass: July 17, 1805
...; and though they are almost perpendicular, we saw mountain sheep on the very tops of them. We saw few other animals to day. The general breadth of the river is 100 ...
Jul 27 1805
Lewis: July 27, 1805
Saturday July 27th 1805. We set out at an early hour and proceeded on but slowly the current still so rapid that the men are...
Aug 23 1805
Camp Fortunate, Sacagawea reunites with Cameahwait — Patrick Gass: August 23, 1805
...ind of shifts made of the skins of these goats and mountain sheep, which come down to the middle of the leg. Some of them have robes, but others none. Some of the me...
Aug 24 1805
Lewis: August 24, 1805
...se people which have almost every appearance of the common sheep. they inform me that they finde this animals on the high mountains to the West and S. W. of them. ...
Sep 4 1805
Joseph Whitehouse: September 4, 1805
...sons froze hard. the mountains covred with Snow. 2 mountain Sheep [ 148 ] 1805] WHITEHOUSE’S JOURNAL Seen by one of the men. we delayed untill about 8 oClock A. M....

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