How Many Dinosaur Species Roamed Earth? It’s Surprisingly Hard to Know

Paleontologists face challenges in accurately estimating prehistoric biodiversity due to incomplete fossil records and difficulties in distinguishing species. Researchers debate whether well-known dinosaur taxa should be split into multiple species. Some argue that current estimates of past species diversity may be too low, potentially skewing our understanding of modern biodiversity trends. Recent genetic studies have revealed "cryptic species" in modern animals, suggesting more diversity than previously thought. Scientists are developing statistical methods to account for fossil preservation biases and sampling issues when analyzing biodiversity trends over time.