New threat to Canada's Pacific humpback whales?
30 November 2014 Last updated at 07:28 GMT
Once hunted to near extinction, the humpback whales of Canada's Pacific are back in larger numbers and the Canadian government has downgraded their status from "threatened" to one "of special concern".
However, there are concerns that the whales face new risks from increased oil and natural gas exploration.
Brandy Yanchyk reports from the coast of British Columbia.