Ducky and Spike's Father is a minor character in The Land Before Time movie series. He is the father of Ducky and 12-20 other swimmers, the adopted father of Spike and the husband of Mama Swimmer. He first appeared in The Land Before Time eating marsh plants while watching his wife lay next to their eggs which hatch. He doesn't appear again until the end of the film showing that he and Mama Swimmer and the other 6 little swimmers have made it safely to the Great Valley and when his daughter brings Spike and introduces him to the little ones as their new sibling he welcomes his new adopted son into the family.
Like most Big Mouthed Swimmers, he based on the Saurolophus; with the original design having accurate details towards the actual dinosaur. His color designs are simple with varying three different shades of purple in contrast to the females in his species; the design furtheron changes in the sequels, though still representing the Saurolophus species, his character design is presented more cartoony. One most distinctive design differentiation to Ducky and Spike's Father is a constant change of color, relatively given the same color pallete as his wife in The Land Before Time II: The Great Valley Adventure; his color scheme changes to a more colorful variety in The Land Before Time V: The Mysterious Island; given a more greenish blue tint with an orange underbelly. This was probably to relate in part with Ducky, Spike and their siblings (having almost the same color scheme); it is also likely due to the current design that helped give Ducky's and Spike's Father a more better description than from the other Saurolophus swimmers.
He makes a cameo in The Land Before Time II: The Great Valley Adventure in which he is seen laying next to Mama Swimmer in their nest at night. He was last seen in The Land Before Time V: The Mysterious Island standing next to Mama Swimmer at the new place the Herd found to live at until the Great Valley gets green again and when the children arrive there on Elsie he goes with his wife to greet Ducky and Spike and in the end he waves goodbye to Elsie. He isn't seen throughout the rest of the movie series after this.
It is believed by some fans that the reason he has such a minor role in the movies, unlike his more prominent wife, is because that the original voice actress for Ducky in The Land Before Time, Judith Barsi, was murdered by her own father before the movie was released.