'Baa'd news for Yukon's Stone sheep: they're not actually Stone sheep

Call it a case of mistaken identity.

Researchers have discovered that Yukon's small population of Stone sheep has been misidentified for years the animals should in fact be classified asDallsheep.

That means that the overall population of Stone sheep (also known as Stone's sheep) in Western Canada is about 20 per cent less than was previously thought.

Both Stone and Dallsheep are subspecies of Thinhorn sheep. Dall(or Dall's) sheep arecommonly whiter in colour and Stone sheep tend to be a darker brown.

Researchers from the University of Alberta used DNA markers to correctly identify about 2,800 animals in the Pelly and Cassiar mountains in southern Yukon, as Dall sheep.

"They have always been classified as Stone's sheep. The previous classification is, as long as you have any kind of dark colourization, you are considered a Stone's sheep," said ZijianSim, a PhDstudent in the department of biological sciences at the University of Alberta.

"But what our genetic evidence is findingis that these sheep, although coat-colourwise they might resemble Stone'ssheep to the south, they are more related genetically to Dall's sheep in the north."

Stone sheep are only found in northern B.C. and Yukon, although Sim says that may need to be re-thought.

"Now we are finding it's even more restrictive basically, only in B.C.," he says.

"There might be some Stone's sheep at the tip of the southern Yukon, but in our entire study, and we studied 2,800 rams, we only found one sheep in the Yukon that we would consider a Stone'ssheep. Only one, and before they thought there were thousands."

Sim says the new research has prompted the B.C. and Yukon governments to talk about co-managing herds that straddle borders.