These three tree species are often referred to as redwoods, but they are very different trees. Their sizes and orgin of habitat are vastly different, but they do share a similar colored bark and are conifer trees which means they bear cones. Giant sequoias are a protected resource, while coast redwoods are often logged for lumber. The dawn redwood is different because they shed their leaves in the fall. At one point, the dawn redwood was considered to be an extinct species, but in 1948 researchers found a few thousand trees living in secluded canyons in China.