The Lions Mane Jellyfish is the largest jellyfish in the world. They have been swimming in arctic waters since before the dinosaurs (over 650 million years ago) and are among some of the oldest surviving species in the world.
The largest can come in at about 6 meters and has tentacles over 50 meters long. Pretty amazing when you think these things have been swimming around for so long.
Arctic Rainbow Photograph by Paul Nicklen A rainbow is reflected in Arctic icy waters in Canada's Foxe Basin. Data from submarines suggest that Arctic sea ice has thinned by 40 percent in the past 30 years. As more water is exposed, the upper ocean absorbs more sunshine, speeding up the decline.