Lythronax differed from most other tyrannosaurids due to its shortened skull with a broadened rear, as well as its forward-directed orbits (which were a direct consequence of its skull morphology).
No other tyrannosauroids had such forward-directed orbits except for Tyrannosaurus and Tarbosaurus, although more derived tyrannosauroids generally had larger and more forward-directed orbits than basal tyrannosauroids.
The discovery of Lythronax suggests that these characters had appeared by at least 80 million years ago.

The forward-directed orbits of Lythronax would have enhanced the field of view of its binocular vision by increasing the separation between the orbits and making their lines of sight more parallel to each other (i.e. reducing the optic axis divergence), which would have given Lythronax depth perception.
In 2006, paleontologist Kent Stevens suggested that the similar orbits of Tyrannosaurus would have aided either pursuit predation by the observation of distant prey and the three-dimensional detection of obstacles, or ambush predation by the ability to judge the timing and direction of lunges.

As a tyrannosaurid, Lythronax would likely have shared the group's other specializations to predatory lifestyles, including large body size; a large skull with powerful jaw muscles and robust teeth; reinforced sutures holding the skull bones together; and relatively small forelimbs.
The teeth and jaw muscles of Lythronax would have contributed to strong bite forces, for not just carving out chunks of flesh but also crushing bone.
The stresses and loads of these bites would have been effectively absorbed by the fused, arched nasal bones and the reinforced sutures.
Lythronax differed from most other tyrannosaurids due to its shortened skull with a broadened rear, as well as its forward-directed orbits (which were a direct consequence of its skull morphology). No other tyrannosauroids had such forward-directed orbits except for Tyrannosaurus and Tarbosaurus, although more derived tyrannosauroids generally had larger and more forward-directed orbits than basal tyrannosauroids. The discovery of Lythronax suggests that these characters had appeared by at least 80 million years ago.
The forward-directed orbits of Lythronax would have enhanced the field of view of its binocular vision by increasing the separation between the orbits and making their lines of sight more parallel to each other (i.e. reducing the optic axis divergence), which would have given Lythronax depth perception. In 2006, paleontologist Kent Stevens suggested that the similar orbits of Tyrannosaurus would have aided either pursuit predation by the observation of distant prey and the three-dimensional detection of obstacles, or ambush predation by the ability to judge the timing and direction of lunges.
As a tyrannosaurid, Lythronax would likely have shared the group's other specializations to predatory lifestyles, including large body size; a large skull with powerful jaw muscles and robust teeth; reinforced sutures holding the skull bones together; and relatively small forelimbs. The teeth and jaw muscles of Lythronax would have contributed to strong bite forces, for not just carving out chunks of flesh but also crushing bone. The stresses and loads of these bites would have been effectively absorbed by the fused, arched nasal bones and the reinforced sutures.
Lythronax