A type of squid native to the Pacific coast of Mexico is attacking dolphins and tuna as the species expands into new waters as far north as Alaska. Now for the time marine biologists can watch these battles from a boat above, monitoring the squids' movements with acoustic technology similar to the equipment used by fisherman to follow school of fish.

Echo-locating sensors developed at Oregon State University and the Monterey Bay Aquarium Research Institute (MBARI) in California have revealed large numbers of Humboldt squid just off Mexico's Pacific coast, in an area where the squid are commercially fished. This tracking system could soon shed some light on whether the squid population's spread out of Mexican waters and up the coastline is due to global warming -- and whether it poses a potential threat to U.S. fisheries and ecosystems.