Dr. Carmina "Bonsy" Skeledon, voiced by Rita Moreno, is a lovely paleontologist and old friend of Ms. Frizzle. She hosted the class on a field trip to her dig site in The Busasaurus. Carmina and Ms. Frizzle briefly reminisced about a time they "went to Scotland in search of the Loch Ness Monster." During the class trip to the dig site, she showed the class a Tyrannosaurus Rex skeleton they had discovered. Ms. Frizzle also gave her a fossilized dinosaur egg, "to add to her collection."