Eight wolves were found poisoned in Oregon. Police are asking for the public’s help

Conservation groups call the deaths shocking and heartbreaking' and have offered a $43,000 reward for information

The dead wolves began turning up in Oregon in early February.

First, state fish and wildlife troopers found an entire pack of five wolves - known as the Catherine pack - killed by poison in Union county. Then, between March and July, authorities found three grey wolves, two females and a male, similarly poisoned to death within the same county about 275 miles east of Portland.