The Pine Tree that Yearns for the Equator

Once upon a time, the Cook pine tree (Araucaria columnaris) was only found on New Caledonia in the Pacific. But over the last couple of hundred years, they were imported and cultivated in far-flung parts of the globe. As they grew tall, a peculiar behavior was noticed among these trees. They have a tendency to lean. It's not just because they are tall, as other, much taller pines manage to grow completely upright. Cook pine trees have their own agenda.
All the Cook pines that grow in the Northern Hemisphere lean to the south, and all that grow in the Southern Hemisphere lean to the north. Those that grow near the equator manage to stand up straight. What's more, the angle of the tilt also depends on location- trees that are further from the equator lean more. The reason for the tilt has not been scientifically proven, but common sense would tell us that the tree is looking for optimized sunlight. However, other pine trees prioritize standing straight for longevity. Something about Cook pine trees makes leaning toward the sun more important than balancing its weight. 

The Pine Tree that Yearns for the Equator