Dino was a recurring DUPLO theme first appearing from 1997, to 1999, and then again in 2007 through 2008. There were 20 sets released from this theme from both decades. In 2012, a theme based on dinosaurs was released for System.
The ThemeTable system is being renovated. See a list of pages tagged Dino (DUPLO) here.
There is a forum about the work here