20 of any gender plus extras.
CAST OF CHARACTERS (# of lines):
THE PLANT-EATING DINOSAURS
MISS SWEETWATER, firm but kind teacher (57)
LITTLE SPIKE, spunky student; child of Mayor Spiketail (95)
GABBY, know-it-all student; child of Loftynose (30)
BUSTER, smart alecky student; child of Jabberjaw (40)
SNAGGLECLAW, clumsy but goodhearted student (115)
PROFESSOR BROADBEAK, easily excited scientist (115)
DOCTOR DUCKBILL, much more sensible scientist (106)
THUNDERFOOT, brawny security guard (9)
STORMBROW, another (13)
JABBERJAW, loves to gossip (49)
LOFTYNOSE, a snob (45)
SHARPTONGUE, town crank (33)
GRAYTOOTH, grumpy oldtimer; parent of Jabberjaw (18)
MAYOR SPIKETAIL, pompous mayor of Fernville (63)
THE MEAT-EATING DINOSAURS
CRUSHER, hotheaded leader (68)
UMBERSNOUT, obsequious to a fault (38)
RUMBLEBELLY, always hungry (47)
PERKY, closet vegetarian (46)
THICKSKULL, a little slow (42)
THE MAMMALS
NIBBLER, nervous, shrew-like rodent (8)
WHISKERS, another (7)
EXTRAS, additional plant eaters, meat eaters, or mammals