Bull sharks and bottlenose dolphins are moving north as the ocean warms
The migration of marine predators could alter food webs in their newly adopted ecosystems
![Bottlenose dolphins](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2018/05/042718_AW_042718_AW_ocean-migration_feat.jpg?fit=860%2C460&ssl=1)
BIG LEAP Bottlenose dolphins were spotted in 2017 off Vancouver Island following a period of warming. It was the first sighting of the warm-water species so far north in Canadian Pacific waters.
L. Halpin