Species may swim thousands of kilometers to escape ocean heat waves
Nearby cool water patches are harder for fish, turtles and whales to find in tropical seas
![a hammerhead shark swimming](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2020/08/080620_cg_oceanheatwave_feat.jpg?fit=1028%2C579&ssl=1)
Hammerhead sharks, which normally range near Baja California, Mexico, were spotted hundreds of kilometers farther north during an intense marine heat wave in the tropical Pacific Ocean in 2015, known as the Blob.
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