Mammal
Pronghorn
Antilocapra americana americana
Photo: Thomas Wolf, www.foto-tw.de, CC BY-SA 3.0
Common Names
Antelope / Wild Goat
Habitat
Niobrara and points west
Conservation
Secure
First Observed
1804-09-14
Observed At
Below present-day Oacoma, Lyman County, South Dakota
Compared to goats or sheep by Lewis and Clark, pronghorn are swift, uniquely North American ungulates of open steppes.
Recent sightings
Where it’s being seen today
8 research-grade iNaturalist observations between 2015–2026. Most recent: 2026-02-23. Sourced from Terrain360 trail captures, cached locally.
Journal References
8 journal entries mention Pronghorn
Sep
5
1804
Lewis: September 5, 1804
Sept 5th saw some wild goats or antelopes on the hill above the Glauber Salts Springs they ran off we could not discover them sufficiently...
Oct
5
1804
Clark: October 5, 1804
5th of October Friday 1804 Frost this morning, Set out early passed a Small Creek on the L. S. saw 3 Tetons on the S....
May
3
1805
Lewis: May 3, 1805
Friday May 3rd 1805. The morning being very could we did not set out as early as usual; ice formed on a kettle of water...
May
5
1805
Lewis: May 5, 1805
Sunday May 5th 1805 A fine morning I walked on shore untill 8 A M when we halted for breakfast and in the course of...
May
8
1805
Clark: May 8, 1805
May the 8th Wednesday 1805 a verry black Cloud to the S W. we Set out under a gentle breeze from the N. E. about...
Jul
24
1805
Lewis: July 24, 1805
Wednesday July 24th 1805. Set out at sunrise; the current very strong; passed a remarkable bluff of a crimson coloured earth on Stard. intermixed with...
Aug
2
1805
Lewis: August 2, 1805
August 2nd 1805. We resumed our march this morning at sunrise the weather was fair and wind from N. W. finding that the river still...
Aug
8
1805
Jefferson/Beaverhead River near present-day Dillon — John Ordway: August 8, 1805
diew. 4 hunters sent out at light, we Set out at Sun rise and proceeded on. passed beautiful praries on each side, but little timber,...
