So as I mentioned, an extinct species doesn't exist anymore. In that case, how do we have information on species that have been extinct even before the humans "arrived"? How do we know how they looked like? According to their fossils of course! What is a fossil you ask? A fossil is any preserved remains or trace of any once-living thing from the past. Like: bones, shells, exoskeletons, stone imprints of animals or objects preserved in amber, petrified wood, oil, coal, and DNA remnants. According to the fossil, scientists can assume how the species looked, its body structure, its diet and a lot more information like where it lived. How do we find said fossils? That is actually not the easiest, because their hard to find and might have already disappeared. Some are microscopical or found deep beneath the ground or sea. For the bigger fossils like the skeletons, bone, and imprints on amber, there are expeditions that are searching for them. It could take years of c