Gray whales migrate up to about 20,000 km round trip
One of the longest mammal migrations links Arctic feeding grounds with warm breeding lagoons off Mexico — roughly 20,000 km round trip for some gray whales.
Calves are born in sheltered shallows; summers refill fat stores on northern bottoms rich with amphipods.
The calendar is written in currents. Half a planet of swimming is the price of seasonal food and safe birth.
Shahzad Mahota
Gray whales migrate up to about 20,000 km round trip
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