How Did Mammals Evolve?

An introduction to the ‘mammal-like reptiles’ that walked the Earth millions of years before the dinosaurs – and from which all modern-day mammals would eventually evolve. Biology - Animal Kingdom - Learning Points. Early reptiles split into two evolutionary branches: sauropsids, or "true reptiles", and synapsids, or "mammal-like reptiles". Dimetrodon and other sail-backed synapsids could maintain a steady body temperature by controlling blood flow to their sails. Mammals evolved from a group of synapsids called the therapsids. While most mammals evolved to give birth to live young, some continue to lay eggs. A Twig Curriculum Film. Delivering key learning points. Get straight to the facts in just three minutes – directly linked to core learning, Twig's curriculum films will fit neatly into your lesson plans.