Bird fossils are the preserved remains or traces of ancient birds that provide valuable information about their evolution and behavior. These fossils can include bones, feathers, and even eggs, allowing scientists to study the physical characteristics of birds that lived millions of years ago. The study of bird fossils helps researchers understand how modern birds, part of the class Aves, have adapted over time. Fossils are typically found in sedimentary rock layers, where conditions were right for preservation. Notable discoveries, such as the Archaeopteryx, show a mix of bird and dinosaur features, highlighting the evolutionary link between these two groups. Analyzing bird fossils contributes to our knowledge of biodiversity and the history of life on Earth.