16. Bluefin Tuna
Bluefin tuna are swift, powerful swimmers capable of crossing the entire Atlantic Ocean. Their long migrations to spawning grounds are guided by a keen sensitivity to temperature gradients, the flow of ocean currents, and subtle geomagnetic cues. This natural navigation system allows bluefin tuna to locate optimal habitats and return to precise locations year after year, despite the vastness and complexity of the marine environment. Source: NOAA Fisheries