The Land Before Time features several dinosaurs.
The Land Before Time . Produced by Sullivan Bluth Studios , Amblin Partners ' Amblin Entertainment and Lucasfilm ( despite not receiving an official credit nor the film 's marketing bearing the studio 's logo ) , it features dinosaurs living in the prehistoric times . The plot concerns a young Brontosaurus named Littlefoot who is orphaned when his mother is killed by a Tyrannosaurus . The film explores issues of prejudice between the different species and the hardships they endure in their journey as they are guided by the spirit of Littlefoot 's mother and also forced to deal with the murderous T-Rex that killed her .