The animal kingdoms of Asia and Australia are worlds apart, thanks to an invisible line that runs right between the two neighboring continents. Most wildlife never cross this imaginary boundary, not ...

In the middle of Southeast Asia, where the lush jungles of Borneo and Sulawesi meet the tropical waters of the Pacific, lies a seemingly invisible border that has baffled scientists for more than a ...

Officially mapped in 1863, but in effect for millions of years, Wallace's Line has maintained two distinct animal kingdoms on either side. Stand on the shores of Bali and look east. Across the water ...

The Wallace Line runs through Asia and Australia, and shows an incongruity in the dispersion of animal species on either side. Researchers have known about the differences in the animals for over 150 ...

While bullets and cannonballs were flying back and forth across the Mason Dixon line in 1862, Alfred Russel Wallace was wrapping up eight years of adventure studying and collecting biological ...