As mentioned earlier,
Archaeopteryx is probably the most well-known transitional or intermediate fossil. According to Wikipedia 11 specimens have been found, plus a single feather that may be from
Archaeopteryx lithographica.
Specimens of Archaeopteryx has a very good discussion and some good photos.
I got to see one of the specimens last June at the Wyoming Dinosaur Center in Thermopolis.
The specimen is inside a glass pyramid and there is a holographic video the appears above it that slowly spins around as it changes from a skeleton into a fleshed out and feathered dinosaur that has front legs that are also wings. It was quite a thrill for me to see this fossil, something I never thought would happen. My wife walked up to me as I stood there and asked why I was crying......
These photos were taken with my phone so the quality is not great, plus the glass pyramid was quite scratched up. I wonder if they ever replace it?
The answer to the question, "where are all the transitional fossils?" is quite obviously, "In museum collections, by the tens of thousands."
What if Eleanor Roosevelt had wings? -- Monty Python
One important characteristic of a theory is that is has survived repeated attempts to falsify it. Contrary to your understanding, all available evidence confirms it. --Subbie
If evolution is shown to be false, it will be at the hands of things that are true, not made up. --percy