Wildlife

American beaver

Castor canadensis
American beaver
Habitat
Missouri and all points west
Conservation
Secure
First Observed
1805-04-18

Nearly wiped out by the fur traders that followed the Corps, beaver are again plentiful throughout North America.

Recent sightings

Where it’s being seen today

18 research-grade iNaturalist observations between 2006–2026. Most recent: 2026-03-27. Sourced from Terrain360 trail captures, cached locally.

Journal References

15 journal entries mention American beaver

Apr 26 1805
Yellowstone-Missouri confluence — John Ordway: April 26, 1805
...pleanty, viz. buffaloe Elk Deer Goats Some bair. pleanty of beaver, fish &C and a beauti- ful country around in every direction, considerable of timber Such as cotton...
May 19 1805
Seaman Bitten by a Beaver — Nearly Dies
... Montana. Lewis recorded that Seaman was "badly bitten by a beaver" after apparently catching or cornering the animal near the water's edge. The beaver severed an art...
Aug 6 1805
Jefferson/Beaverhead River near present-day Dillon — Joseph Whitehouse: August 6, 1805
a clear morning. we Set out as usal, and proceeded on hall- ing the canoes up the rapids. the bottoms low and covered with Small...
Aug 6 1805
Jefferson/Beaverhead River near present-day Dillon — John Ordway: August 6, 1805
... it to a pole at the forks. But the pole was green, and the beavers cut it down before Clark's arrival. In ignorance of Lewis' note Clark proceeded, with great diffic...
Aug 6 1805
Jefferson/Beaverhead River near present-day Dillon — Patrick Gass: August 6, 1805
see if the canoes had come up that far, and came upon the north branch about 2 miles above it. Here we discovered that the...
Aug 7 1805
Jefferson/Beaverhead River near present-day Dillon — Joseph Whitehouse: August 7, 1805
a clear cool morning. one man out to hunt. we unloaded one of the Small canoes and halled it out in a grove of cotton...
Aug 7 1805
Jefferson/Beaverhead River near present-day Dillon — Patrick Gass: August 7, 1805
which was fair and clear, and where Capt. Lewis took a meri- dian altitude, which made the latitude of this place 4§ 2 53 north....
Aug 7 1805
Jefferson/Beaverhead River near present-day Dillon — John Ordway: August 7, 1805
one of the Small canoes and hailed it out in the bushes in a grove of cotton timber on L. Side of the forks and...
Aug 8 1805
Jefferson/Beaverhead River near present-day Dillon — Joseph Whitehouse: August 8, 1805
a clear cold morning. 4 hunters Sent out eairly to hunt. we Set out at Sunrise, and proceeded on passed beautiful Smooth prarie on each...
Aug 8 1805
Jefferson/Beaverhead River near present-day Dillon — John Ordway: August 8, 1805
...he prarie is covred with grass which is high in places, the beaver abounds on these Rivers, they have dams and ponds &. C. &. C. in different places, the Soil of thes...
Aug 8 1805
Jefferson/Beaverhead River near present-day Dillon — Patrick Gass: August 8, 1805
...ke did not get the note left at the point, which was that a beaver had cut down and dragged off the pole, on which I had fixed it.
Aug 9 1805
Jefferson/Beaverhead River near present-day Dillon — Joseph Whitehouse: August 9, 1805
...d of it Soon. Some Thunder. the Musquetoes troublesome. the beaver pleanty as usal &c. Saw Snow on the Mountains Some distance a head. pro- ceeded on passed the old b...
Aug 9 1805
Jefferson/Beaverhead River near present-day Dillon — John Ordway: August 9, 1805
...n a fiew days. Some thunder the Musquetoes troublesome, the beaver as pleanty as usal, &.C. Saw Snow on the Mountains Some dis- tance a head, proceeded on passed the ...
Aug 9 1805
Jefferson/Beaverhead River near present-day Dillon — Patrick Gass: August 9, 1805
with some dew; proceeded on till g o’clock when we halted for breakfast. Here one of the hunters came to us who had been out...
Aug 10 1805
Jefferson/Beaverhead River near present-day Dillon — Joseph Whitehouse: August 10, 1805
... and Camped on the Star? Side. [ 131 ] CHAPTER Kia FROM THE BEAVER’S HEAD TO THE GREAT DIVIDE August 11-16, 1805

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