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Emperor penguins find the same mate for years. They recognize each other by voice among thousands.
Emperor penguins stay with one partner for life. Each season they find last year"s mate among thousands using voice recognition.
The male holds the egg on his feet for 65 days while the female hunts. He eats nothing and may lose half his body weight.
Penguins that lose their partner mourn and sometimes skip the next breeding season entirely.
Source: BBC Nature