Each
winter, Pacific Gray whales head south from their Arctic
feeding
grounds. Most spend winter in the warm waters off Mexico's Baja
coast. Mothers raise their young before migrating
back to the Arctic in the spring. But one year, scientists discovered
something
astonishing
.
. .
![](https://s3.us-east-2.amazonaws.com/journeynorth.org/images/graphics/gwhale/bj/BajaJonesWhaleWatch091.jpg)
Photo:
Keith Jones
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