A pair of harbour seals wearing satellite linked transmitters on their heads face each after being released into the waters of Howe Sound in Porteau Cove, British Columbia November 20, 2013. The seals had received months of care at the Vancouver Aquarium Marine Mammal Rescue Centre after being rescued from the wild. Wearing the transmitters will help track their movements after their release. REUTERS/Andy Clark (CANADA - Tags: SOCIETY ANIMALS TPX IMAGES OF THE DAY) 

A harbour seal wearing a satellite linked transmitter on its head waits to be released into the waters of Howe Sound in Porteau Cove, British Columbia November 20, 2013. The seal is one of two which had received months of care at the Vancouver Aquarium Marine Mammal Rescue Centre after being rescued from the wild. Wearing the transmitters will help track their movements after their release. REUTERS/Andy Clark (CANADA - Tags: SOCIETY ANIMALS) 

A pair of harbour seals wearing satellite linked transmitters on their heads wait to be released into the waters of Howe Sound in Porteau Cove, British Columbia November 20, 2013. The seals had received months of care at the Vancouver Aquarium Marine Mammal Rescue Centre after being rescued from the wild. Wearing the transmitters will help track their movements after their release. REUTERS/Andy Clark (CANADA - Tags: SOCIETY ANIMALS) 

Members of the media record a harbour seal wearing a satellite linked transmitter making its way into the waters of Howe Sound after its release in Porteau Cove, British Columbia November 20, 2013. The seal is one of two which had received months of care at the Vancouver Aquarium Marine Mammal Rescue Centre after being rescued from the wild. Wearing the transmitters will help track their movements after their release. REUTERS/Andy Clark (CANADA - Tags: SOCIETY ANIMALS) 

A pair of harbour seals wearing satellite linked transmitters on their heads are released into the waters of Howe Sound in Porteau Cove, British Columbia November 20, 2013. The seals had received months of care at the Vancouver Aquarium Marine Mammal Rescue Centre after being rescued from the wild. Wearing the transmitters will help track their movements after their release. REUTERS/Andy Clark (CANADA - Tags: SOCIETY ANIMALS) 

A harbour seal is reluctant to leave its cage after its release at Howe Sound in Porteau Cove, British Columbia November 20, 2013. The seal is one of two which had received months of care at the Vancouver Aquarium Marine Mammal Rescue Centre after being rescued from the wild. Wearing the transmitters will help track their movements after their release. REUTERS/Andy Clark (CANADA - Tags: SOCIETY ANIMALS) 

A harbour seal wearing a satellite linked transmitter on its head is pictured after its release into the waters of Howe Sound in Porteau Cove, British Columbia November 20, 2013. The seal is one of two which had received months of care at the Vancouver Aquarium Marine Mammal Rescue Centre after being rescued from the wild. Wearing the transmitters will help track their movements after their release. REUTERS/Andy Clark (CANADA - Tags: SOCIETY ANIMALS)