A lost children's educational animated 13-episode TV series from the early 90s (could be earlier, but not beyond 1993).
The series was about two mice named Claudia and Tati (or Tatti, but that's just how they were named in a local dub version), and their adventures in the world of dinosaurs. Each episode they would travel to the dinosaur world through an enchanted, magical book, and there they would observe and study about different types of dinosaurs. In the final episode, they witness the dinosaurs' extinction.
In the same local dub, the series was named (in a free English translation) "The Wonderful World of the Dinosaurs".
I have yet found any piece of information, no matter how much I search, no matter what language I use, no matter what the keyworld is, just nothing. I mean, how hard is to find one series with mice and dinosaurs? Pretty much very...
However, there is no opening and ending in them. Frustrated, I kept searching and found a Korean blog, with its blogger embedded the first 4 episodes from another video source in the blog - this time with an opening and ending! (which I compiled together and uploaded to the link above).
So, the series is 12-episode Italian-produced in 1993. Created and directed by Gianni Boni with a team of animators under the collective name "Gruppo l'Arca di Noe'" ("L'Arca di Noe'" is also the name of the production itself). The main characters are, of course, the young fella Tete' (could also be written as Tetè, if I'm not wrong), and Clodoveo (judging by the masculine name, I think he might be a male in the original Italian version, but could have been exported as a female named Claudia when distributed to other countries such as Israel and South Korea), Tete''s dinosaur expert and guide all along the way.
Seems that it is completely wiped out from the Italian memory (or the Italian web, at least). No mention of it whatsoever. Boni is also known for another series which might say nothing to many of you - "Zig & Zag e i Loro Perche''" (Zig & Zag Wonder Why), but this one is somewhat documented under Boni's name.
Anyway, thank you there very much for trying to help me to find this series! Much appreciation to all of you!
Update: Okay, there's 13 episodes after all. The last episode where they suppose to witness the dinosaurs' extinction is missing from the Korean YouTube playlist.