Fans of blue whales can now chart the daily movements of a pair of these leviathans, thanks to Iceland's Marine Research Institute (MRI).
On May 29, researchers with the MRI tagged two blue whales with GPS trackers off the Iceland's north coast. The institute has posted a web page for each whale, plotting their precise daily locations -- one whale you can check out here, and the other you can follow here.
Iceland is a prominent summer home for blue whales, which make their living off its waters in warmer months, before swimming more than 3,000 miles to the waters off West Africa in the winter.
It would be difficult to overstate the size of the blue whale. They're the biggest animals that have ever graced Earth -- larger even than dinosaurs. They're bigger than the biggest bus you could ever ride, and humans could get lost in their blood vessels.
Need more? We're talking length that can clear 100 feet, and weight of a couple of hundred tons. A blue whale's heart alone weighs a literal ton.
The endangered creature is rare to see, and it can live upwards of 80 years in the wild, on a diet made up almost completely of krill (small shrimp-like critters). How can they get by on the tiny-krill diet? Easy -- they eat up to four tons of them, every day.
More about blue whales: