Roar
Roar.
Controls:C
Bite
Bites enemies, with lower damage while drowsy.
Controls:LMB
Grab / Release
Grabs a creature it can carry in its jaws. Press again to release it.
Controls:RMB
Shake Prey
Bites and shakes a living creature held in its jaws.
Controls:LMB: holding a creature
Sleep / Wake
Let the Megalosaurus sleep to recover from sleep deprivation, or wake it when needed. Fighting and moving during the day build sleep debt; the menu can lock its sleeping or waking state.
Controls:Hold E: Go to Sleep / Wake Up
Default PC controls. Custom keybindings may differ.