Imagine hunting for a fish dinner in the middle of the ocean, in the middle of the night without flashlight, compass, or iPhone... and then to find a way back to land. This is what seals must accomplish on a regular basis to survive. These pinnipeds, so often seen posing with a ball balanced perfectly on a whiskered nose or bowing gracefully for a circus display, have skills that cannot be seen on the stage. In fact, they give our close relatives the chimpanzees something to envy.
One sign of intelligence is an ability to recognize and respond to human gestures. Chimpanzees have difficulty doing this. Dogs are one of a few species capable of doing so. It turns out seals, too, can recognize human gestures and, surprisingly, perform even better than dogs at these tasks, as has been demonstrated through research. The grey seal outshone almost all the other animal contestants.
A dog resting comfortably by the fireplace after a nice meal is a familiar sight for many of us, and it does not take a stretch of the imagination to picture a seal doing the same on a bit of rock or sand after a dinner of fish. The intelligence of the two creatures is comparable, and to some degree, the look of their furry heads, pointy noses, and soulful eyes. Perhaps it's time to extend a little of the love we feel for our pets to their oceanic counterparts far out in the sea. There is a good reason.
Seals face many threats in the wild - loss of habitat, loss of food, pollution, numerous climate change impacts. But there may be a new one. Seals hunt for food at night and must find their way back to shore. Studies have demonstrated that harbor seals can navigate using a lodestar and learned star courses. What would happen if this vital star map was disrupted?
Low Earth orbit (LEO) satellites are brightly visible in the night sky, and could interfere with star navigation. SpaceX, the largest producer of LEO satellites to date, has launched over 3,000 Starlink satellites with plans to launch as many as 42,000. And while SpaceX is the the largest producer of LEO satellites, it is not the only one.
Astronomers have raised concerns that low Earth orbit satellites are visible and inhibit scientific research. The International Association of Astronomers has set up a Centre for the Protection of the Dark and Quiet Sky from Satellite Constellation Interference as a response. The astronomer Meredith Rawls has described the plans of launching thousands more satellites in the coming years as "an unsustainable trajectory".
In addition to creating streaks in photos and hampering astronomical observations, satellites will also handicap creatures like seals, migratory birds, and even the humble dung beetle, all who use stars for navigation.
Among birds, Indigo buntings prefer to travel at night during migration. Scientists studying the buntings found that the birds rely on star patterns to determine north. European robins and yellow underwing moths also use the stars in travel.
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