Hi @ca4ef0d8, to answer your question, yes, ratites like ostriches do descend from dinosaurs. Specifically, they are believed to have evolved from a group of theropod dinosaurs called the ornithomimosaurs, which were similar in appearance to ostriches and other ratites. However, it's important to note that the ratites and other birds evolved separately from each other, so while they share a common ancestor in the form of a dinosaur, they have different evolutionary histories. Does that help clarify things?