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if every specie that ever existed was successful, why did they even evolve? they would have no need to, because they were succssesful.
Successful doesn't mean perfect, it just means the species survived long enough to reproduce. So a species will keep evolving. Other factors can affect evolution too, such as changing climates.
We don't have more transitional fossils because the chances of a dead animal becoming a fossil is tiny. So many factors have to come together perfectly for a fossil to form. Add to that the fact that we have only excavated a tiny percent of the world, and that we'll only ever be able to excavate a tiny percent of the world, and you get your answer as to why we haven't found more.
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