The Arizona Game and Fish Department says it remains optimistic about the relocation of Bighorn Sheep to the Catalina Mountains, north of Tucson, despite the death of another sheep at the hands of a mountain lion.

Spokeswoman Diana Tilton says the fourth sheep to die succumbed to stress-related issues due to its relocation.

“The sheep have kind of gone into vegetation that’s a little bit thicker then maybe they were used to and it’s making them, maybe a little more vulnerable,” Tilton said.

She says the problems are not unexpected and Game and Fish remains committed to relocating more sheep into the area next year.