Dr. Dinosaur, Sam, and Rex explore the amazing story of evolution - how living things slowly change over millions and millions of years, and how that incredible journey led to the warm, fuzzy mammals we know and love today!

Dr. Dinosaur, Sam, and Rex dive deep into the ancient ocean to meet the mighty Mosasaurus! They compare this prehistoric sea lizard to today's great white sharks, orcas, and other ocean creatures, discovering what made Mosasaurus one of the most incredible hunters the seas have ever known.

Dr. Dinosaur, Sam, and Rex explore the mighty Allosaurus and other huge land predators that once roamed the Earth. They discover how big these hunters were, what made them special, and how they compare to each other — all with jokes, roars, and plenty of wonder!

Some dinosaurs grew suits of armor made from hard, bumpy bone embedded right in their skin. Ankylosaurus wielded a massive tail club it could swing like a hammer, while Sauropelta bristled with spikes—two very different strategies for staying safe in a dangerous world. The episode digs into how these plant-eating giants protected themselves and what made each one's defenses unique.

Sixty-six million years ago, a massive asteroid slammed into Earth and wiped out the dinosaurs—but how exactly did one giant space rock end all those enormous creatures? This episode breaks down the science of the impact, from the enormous dust cloud that blocked the sun to the dramatic changes in climate that followed. Along the way, young listeners discover which animals managed to survive and why, turning one of history's biggest disasters into a story full of wonder.

Some ancient creatures were enormous compared to their modern relatives, while others were surprisingly tiny — but why? Starting with the fascinating trilobite, a roly-poly-like sea creature that roamed ocean floors hundreds of millions of years ago, this episode explores how environmental conditions shaped the sizes of animals throughout history. From giant dragonflies to miniature ancient horses, listeners discover the surprising forces that determine how big or small a creature can grow.

Stegosaurus is famous for its broad back plates, but its lesser-known cousin Kentrosaurus sported a very different arrangement of spikes and armor. This episode breaks down how these two members of the stegosaur family compared in size, defense, and lifestyle, exploring what made each one uniquely equipped to survive millions of years ago.