by Matthew Cobb
Here’s the branching path from then to now, covering about 3.6 billion years (not to scale). Press the arrow to watch the gif. Some of the earlier bits are somewhat guesswork, but you get the idea.
JAC: Note that this animation is misleading in that it presents our species as the culmination of evolution, which of course is not true. In that sense its progressivism is wrong. They could easily have put a squirrel or a cactus as the final step!