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The icebergs are comparable in size to some of the smaller icebergs found off present-day Antarctica, such as blocks that calved from the Larsen B ice shelf in 2002.

Climate change is unlikely to have been behind the birth of A23a because it calved so long ago, before much of the impacts of rising temperatures that we are now seeing.

Farmers often move cattle across great distances, for calving in one place, raising in warm, dry climates, and milking in cooler ones.

Many dairy farms schedule calving to occur in late winter or early spring.

The whales feast all summer long, and only then embark on a 6,000-mile journey south to Mexico, where females calve and nurse their young in the warm and protected inlets along the Baja Peninsula.