On Hateg Island, a pair of dwarf Taracscosaurs are seen hunting a Magyarosaurus herd, successfully killing a slower individual. A trio of these dwarves later appear feeding on another Magyarosaurus. Pod approaches the group, and the male sees him and attempts to scare him away. Pod attacks and kills the Tarascosaur, scaring off the females and leaving the carcasses to Pod.
If this dwarf species did exist, it wouldn't be the top predator, as the pterosaur Hatzegopteryx is currently thought to have occupied this niche (though it had only been named while Dinosaur Planet was midway through production).