Insects.

A scientist friend of mine tells me that very soon in the evolutionary trajectory of insects they will notice, as we have long ago, that in the sky there is a giant ball of fire. They will one by one give up their daily routines of digging and eating dirt and they will begin moving towards it. The ones with wings will carry those without. Some of these combinations will move very quickly, traversing large portions of the distance between them and the sun.

by Sebastian