The lost whales in the Sacramento River are on their way home, but may now be in danger from large ships. The mother humpback and her calf had lingered more than a week in the freshwater river, but now have made it to about 50miles from the ocean. The closer they get to the sea, however, the larger the vessels they will have to avoid.
The whales are also in danger from infection, due to skin damage from freshwater swimming. Vets have injected the pair with antibiotics to try to slow the damage. The whales also could take a wrong turn, so rescuers are trying to block off small tributaries the whales could swim into and get stuck.