Incisivosaurus, which means "incisor lizard," is a genus of small theropod dinosaurs that likely had herbivorous dietary habits. These dinosaurs date back to the early Cretaceous Period and were found in what is presently the People's Republic of China. One of the most remarkable and distinctive features of this dinosaur is its apparent adjustment to a herbivorous or omnivorous way of life. Its name, "Incisivosaurus," is derived from its prominent, rodent-like front teeth, which display wear patterns typically associated with plant-eating dinosaurs. The specific name, "gauthieri," is a tribute to Dr. Jacques Gauthier, a trailblazer in the field of phylogenetic classification methods. It is believed that Incisivosaurus, much like many other maniraptoran theropods, likely had feathers. Estimates suggest that its overall body length ranged from approximately 0.8 to 1 meter (2.6 to 3.3 feet), and its weight fell between 2 to 4.6 kg (4.4 to 10 lbs).

In the initial account of Incisivosaurus was revealed that the skull, measuring approximately 10 cm (3.9 in) in length, contains the most comprehensive set of teeth among all known oviraptorosaurs. Their cladistic investigation suggested that Incisivosaurus occupies the basal position within the oviraptorosaurian group, signifying a more primitive status compared to Caudipteryx and the oviraptorids.

Furthermore, alongside these distinct characteristics, Incisivosaurus displayed several traits in common with conventional oviraptorosaurs, which led to its classification within this group. Various features, such as its numerous teeth (unlike most advanced oviraptorids which were toothless), indicate that it belonged to the more primitive spectrum of this group. Additionally, certain aspects of the skull even suggest a potential connection with the therizinosaurs, another theropod group presumed to have been herbivorous.

In a study conducted in 2022, researchers investigated the bite force of Incisivosaurus and compared it with that of other oviraptorosaurs like Citipati, Khaan, and Conchoraptor. The findings indicate that Incisivosaurus possessed an exceptionally strong bite force, similar to ornithomimosaurs, at a remarkable 33 times its own body weight. This substantial bite force, combined with the moderate jaw gape typically observed in oviraptorosaurs, suggests that these dinosaurs were primarily herbivorous. However, their diet seems to have consisted of tougher plant material compared to other herbivorous theropods present in the same environment, such as ornithomimosaurs and therizinosaurs. These examinations propose that oviraptorosaurs may have been versatile and powerful biters, potentially specializing in a range of foods and engaging in niche partitioning based on factors like body size and jaw function.