Dinosaurs

Dinosaurs were a diverse group of reptiles that dominated life on land for over 160 million years during the Mesozoic Era (about 252–66 million years ago). They included everything from small, bird‑like hunters to enormous long‑necked herbivores and heavily armored tank‑like species.

Lived mainly during the Triassic, Jurassic, and Cretaceous periods.
Are defined by specific features of their hips, legs, and ankles that allowed an upright stance (legs under the body, unlike modern lizards).
Included both bipedal (two‑legged) and quadrupedal (four‑legged) forms.
Were mostly terrestrial (land‑dwelling), though some could swim.

Modern scientific consensus:

Birds are living dinosaurs (specifically, avian theropod dinosaurs).
Non‑avian dinosaurs went extinct ~66 million years ago, likely due to a combination of a giant asteroid impact and intense volcanic activity, which drastically changed global climate.

Use the child thoughts under this one to explore:

Their time periods (Triassic, Jurassic, Cretaceous)
Major dinosaur groups (saurischians, ornithischians, theropods, sauropods, etc.)
Biology and behavior (warm‑blooded vs. cold‑blooded, feathers, nesting)
Fossils and paleontology (how we know what we know)
The mass extinction that ended the age of non‑avian dinosaurs.