Discovering · history & evolution
150 million years of avian evolution.
Follow the evidence from feathered theropods and early avialans through the K–Pg extinction, later bird radiations, and the still-incomplete fossil history of parrots.
Follow the clue, and keep the uncertainty
A feather can be insulation before it is a flight surface. A foot can reveal a way of moving through trees. A law can mark a change in how people understand the cost of taking birds from the wild.
150M-Year Interactive Visual Timeline
From Archaeopteryx to modern Psittaciformes across 8 evolutionary epochs.
02Dinosaur-to-Bird Theropod Evolution
Feather evolution, hollow bone light-weighting, and avian lung mechanics.
03The K–Pg extinction and survival
What the Chicxulub impact changed 66 million years ago, and how seed access, ecology, body size, and other factors may have shaped survival.
04Early parrot-lineage evidence
Eocene fossils, uncertain relationships, later parrot diversification, zygodactyl feet, and beak prokinesis without claiming a settled crown-group origin date.
05Antiquity & Conservation History
Greco-Roman pet history, 1992 US Wild Bird Conservation Act, and sanctuary ethics.
06Trade to Sanctuary
CITES, U.S. import controls, legal provenance, rescue, and modern sanctuary responsibility.
VOL IIDeep Time — the 230-million-year lineage
Volume II: the theropod ancestry behind every living bird, from the first filaments to the K-Pg boundary, with the fossil evidence graded claim by claim.
From Theropod Dinosaurs to Modern Psittaciformes
Birds are living avian dinosaurs and the only dinosaur lineage to survive the end-Cretaceous extinction. The parrot fossil record includes Eocene birds with combinations of parrot-like and raptor-like traits, but fossil placement and the timing of modern parrot origins remain active research questions. Zygodactyl feet and a mobile upper beak are important parrot adaptations discussed later in the guide, not traits assigned to every theropod ancestor.
Evolutionary history is assembled, not narrated from a complete record
Fossils preserve unevenly. Forest birds, small bones, and tropical environments can leave especially incomplete traces. Researchers therefore combine anatomy, geological age, environment, and—when modern lineages are involved—molecular evidence. A new specimen may strengthen a relationship, move a branch, or reveal that a familiar label gathered unlike animals together.
That is why the History routes separate strong evidence from attractive stories. “Birds are living dinosaurs” is supported by a broad body of evidence. The exact position of an early parrot-like fossil may remain debated. Curiosity grows when those two levels of confidence are allowed to coexist.