Paleocene dinosaurs describe families or genera of non-avian dinosaurs that may have survived the Cretaceous–Tertiary extinction event 65.5 million years ago. Although almost all evidence indicates that dinosaurs (other than birds) all went extinct at the K-T boundary, there is some scattered evidence that these non-avian dinosaurs lived for a short period of time during the Paleocene epoch. The evidence for Paleocene dinosaurs is rare and remains controversial.