To start this thread for links you find interesting, let us imagine a different sort of Earth.
Sixty-five million years ago, a huge chunk of rock slammed into the Yucatan Peninsula, carving out the Chicxulub impact crater and wiping out a good chunk of Earth's life, including all dinosaurs except for the birds. In the following millions of years, mammals diversified, growing to impressive sizes once reserved for the dinosaurs, eventually leading to a strange bipedal primate capable of building civilizations. This is the Earth we all know.
But...what if the Chicxulub meteor missed? What if there had been no mass extinction 65 million years ago? What sort of creatures might inhabit this speculative Earth?
Head to the alternate Earth known as Spec and find out one possibility...
