This Invisible Line Stops Animals — Here’s the Reason

There’s an invisible line running through Indonesia that animals refuse to cross, and it splits the wildlife of Asia and Australia like two different worlds.
This boundary, known as the Wallace Line, marks where species suddenly change — tigers, elephants, and monkeys on one side, and kangaroos, cockatoos, and marsupials on the other.
Scientists discovered that deep ocean trenches and ancient sea levels kept these animal groups separated for millions of years, even when humans could cross freely by boat.
The line still affects evolution today, shaping ecosystems and creating one of the most dramatic natural divides on Earth.
And in this video, you’ll find out why this invisible barrier exists, how it formed, and what it reveals about the wild history of our planet. Animation is created by Bright Side.
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