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Rocky Mountain Big Horn Sheep (Ovis canadensis)

These highly revered and exotic wild ungulates are native to British Columbia's East Kootenays, where we constantly see them grazing along the roadsides, and although this is their home range I am always in awe at the sight of them.

The rams are identified by their distinctive "C" shaped curled horns composed of keratin, which grow continuously throughout their life time, reaching spreads of up to three feet and weighing up to 40 pounds.   Rugged "cross-ridge horn rings" are formed each year and by counting these we are able to determine their age.  In the winter when food is scarce horn growth decreases leaving less distinct and narrower seasonal rings interspersed between the annual rings.  When the curled horns of a seven or eight year old ram begin to block his peripheral vision he may purposely break the tips off on rocks.  This is called "brooming".  The ewes have smaller pointed horns.  

Ram horns are powerful weapons used as battering rams in the fall rutting season.  With larger males weighing some 250 lbs, they ram heads with such force that their skulls would split, save for their possessing unique double craniums which are padded and separated by an inch of spongy mass.  These head-on "butting battles" at speeds of up to 20 mph (32 km/h), sometimes last for several hours.  Hence,  due to these battles, the life expectancy of the competitive big horn rams, which averages14 years, decreases with the size of their horns.   

As seen in the above photo, when the fall rutting season is passed, matched rams can be seen "hanging out" and "rubbing shoulders" in amicable groups. 

From April to June after a gestation period of approximately six months,  the ewes seek out isolated inaccessible cliffs to give birth to their single lambs (rarely twins). The little lambs remain hidden for a week and are weaned within 6 months. 

Bighorn sheep are excellent rock climbers and jumpers and good swimmers.  Their hooves are hard at the outer edges with spongy centers allowing for good traction on the cliff faces.   Bighorn can catch a foothold in places as narrow as two inches.

As can be seen in my photos, these remarkable creatures are so used to people that they either just look at us with mild curiosity, or continue grazing nonchalantly as we jockey closer for photos.  They are however wild creatures and can be dangerous if disturbed and provoked, so I took these digital photos out of my car window.

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BIG HORN DIGITAL PHOTOS

South Columbia Lake Big Horn Herd
SE Corner of Columbia Lake North of Canal Flats
February 26, 2013


 

BIG HORNS IN THE BACKYARD
Fairmont Hot Springs Area 
Selkirk Mountain Range of the Canadian Rocky Mountains
 British Columbia, Canada
March 24, 2005

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  Rocky Mountain Big Horn Sheep - Grazing Rams
South of Radium Hot Springs, British Columbia
February 2002

Rocky Mountain Big Horn Sheep - Ewe with Lamb
Kootenay National Park, Near Radium Hot Springs, British Columbia
October 2002