Two Frenchmen were subjects of Emperor penguins. For two years they followed and filmed them in Antarctica. They followed them from land to sea and back again, theough cold Antarctic ewather. They watched the chicks hatch. Then their mothers went to sea to feed for two months while their fathers fasted and carried the eggs and kept them warm to hatch. The mothers returned and the fathers took off to feed. Those who suevived returned, each only to his own chick. They're not mammals so they couldn't produce milk for their young so they gave food from their tummies. At the end of each year's cycle the penguins and thier subjects with cameras followed them and brought back this miraculous tale of survival.
More migration and survival. Bird flocks from around the world flew thousands of miles round trip, showing their backs, shoulders and wings in motion from thousad of feet up. A bit of tragedy here: three times during the filmming of this four year sags, game hunters with guns shot birds down and we saw them fall. However most of the birds returned home for their nest migration cycle to breed in summer when it's warmer and feed all winter when it's colder.