There is an old line that runs between two Indonesian islands that is both real and...not real. 0:00 intro 01:25 wallace line 08:40 outro alternative title :- * The Invisible Barrier Keeping Two Worlds Apart * In between two of the islands of Indonesia, there’s an ancient line that is both real and…not real. * the line that divides 2 world *a live that no animal crosses *the line most animal don't cross in the video:- In between two of the islands of Indonesia, there's an ancient line that is both real and not real. You can't see it, but it's there all the same. If you stood on the Coast of Bolly and looked east to the shores of Lombok, you'd be staring right at the line's narrowest point, a 32 kilometer stretch of water that seems pretty unassuming. This invisible barrier weaves its way through the entire Malay archipelago, the largest collection of islands on the planet. See, on the western side, the animal life is characteristic of Asia, featuring rhinos, elephants, tigers, and woodpeckers, to name a few. But cross the line and things suddenly change. You won't find those same species on the Eastern side. Instead, the islands have a totally different caste of ecological characters, including marsupials, Komodo, dragons, cocotus, and honey eaters. This is what scientists call a biogeographic boundary, the meeting point of two regions of biodiversity that are highly distinct. And this particular line, called the Wallace line, is perhaps the sharpest and most iconic of all. So how did this invisible line come to be? Why does it shape the distribution of so many species? How did we figure out the path it takes? And how could it be both real and imaginary? The Wallace line was first sketched out in 1859 by a guy named, wait for it, Wallace. Alfred Russell Wallace, to be exact, a British naturalist who you might have also heard of as the co discoverer of natural selection. That concept came to Wallace in a literal fever dream as he lay bedridden with malaria during part of his eight year trip around the Malay archipelago. And while it ended up being overshadowed by Darwin on that front, the second best idea he had on that trip was the existence of the Wallace Line. I mean, two good ideas in one trip. This idea helped to forever establish him as the father of biogeography, the study of the distribution of living things. He had spent his voyage observing and collecting as many species as he could, hopping from island to island across almost the entire archipelago. And it was as he moved east from Bolly to Lombok that he first noticed something intriguing. Even though the islands were separated only by a narrow strait, the change in animal life wasn't gradual and subtle. It was sudden and distinct. Wallace saw the differences in animal life between the two as being even more striking than between England and Japan. Tags :- wallace line,alfred russel wallace,the wallace line,wallace,wallace line pdf,wallace line upsc,what is wallace line,linea di wallace,wallace line slideshare,wallace line dermatology,wallacea,alfred russel wallace (author),wallace linie erklärt,wallace linie theorie,wallaca linie,wallace linie phänomen,was ist die wallace linie,george wallace,why is the wallace line important,wallace line is present in between,the wallace line and the huxley line wallace line,wallace,wallace effect,wallacea,alfred wallace,paleocontinents,natural selection,sea level,bali,plate tectonics,alfred russel wallace,australasia,indian ocean,islands,natural history,evolution,australia,education,malay archipelago,amazon river basin,exploration,hank,asia,paleontology,olivia gordon,green,fauna,sahul,learn,charles darwin,tectonic plates,science,sunda,flora,lombok,biology,geology,scishow,geography