A file picture taken at Tokyo 's Ueno Zoo showing tagged penguins. Tagging penguins with flipper bands harms their chances of survival and breeding, a finding which raises doubts over studies using these birds as telltales for climate change, according to biologists. Photo courtesy: AFP

File photo showing a little penguin walking on the beach near Sydney, Australia. Tagging penguins with flipper bands harms their chances of survival and breeding, a finding which raises doubts over studies using these birds as telltales for climate change, according to biologists. Photo courtesy: AFP

File photo showing a colony of king penguins huddle together on Possession Island in the Crozet archipelago in the Austral seas. Tagging penguins with flipper bands harms their chances of survival and breeding, a finding which raises doubts over studies using these birds as telltales for climate change, according to biologists. Photo courtesy: AFP

File photo showing a colony of king penguins and an elephant seal on Possession Island in the Crozet archipelago in the Austral seas. Tagging penguins with flipper bands harms their chances of survival and breeding, a finding which raises doubts over studies using these birds as telltales for climate change, according to biologists. Photo courtesy: AFP