Does anyone know of evidence that cycads were dispersed by dinosaurs? I suppose it could be true, but some birds and small mammals co-existed with the later dinosaurs, and could have dispersed cycads prior to 65 Mya. If there really was a drop in cycad diversity when the dinosaurs became extinct, as the article says, this could very well have been an effect of the same environmental changes (meteors, etc) that wiped out the dinosaurs. Lou