Tyrannosauroidea

Tyrannosauroidea is a clade of theropod dinosaurs that includes Tyrannosaurus and its close relatives, spanning early small-bodied forms and later large predators.

Theropoda: Theropoda is a dinosaur clade that includes mostly bipedal carnivores as well as birds. Tyrannosauroidea is nested within this diverse dinosaur lineage.
Tyrannosauroid growth: Tyrannosauroid growth is the pattern of body-size and skeletal change during an individual's development. Growth series reveal how some tyrannosauroids transformed from juveniles into massive adults.
Guanlong: Guanlong is a Late Jurassic tyrannosauroid from China, known for a prominent crest on its skull. Its early age and modest size illustrate the group's origins before giant forms.
Tyrannosaurus rex: Tyrannosaurus rex is a species of giant tyrannosaurid dinosaur from the Late Cretaceous of North America. Its fossils helped make tyrannosauroids familiar, though it is only one late member.
Late Cretaceous terrestrial revolution: The Late Cretaceous terrestrial revolution describes major changes in land ecosystems during the latter part of the Cretaceous Period. Derived tyrannosauroids became dominant large predators in several northern ecosystems.
Coelurosauria: Coelurosauria is a theropod clade that includes tyrannosaurs, ornithomimosaurs, and birds. This broader clade places tyrannosauroids among close relatives such as birds.
Tyrannosauroid bite force: Tyrannosauroid bite force is the force produced by the jaws when biting or crushing prey. Skull and jaw mechanics help explain the powerful feeding of later tyrannosauroids.
Dilong: Dilong is an Early Cretaceous tyrannosauroid from China whose fossils preserve filamentous integument. It provides direct evidence of feather-like coverings in an early tyrannosauroid.
Henry Fairfield Osborn: Henry Fairfield Osborn was an American paleontologist who named Tyrannosaurus in 1905. His naming of Tyrannosaurus shaped the group's public and scientific identity.
Apex predator: An apex predator occupies the top trophic position in an ecosystem, with few or no natural predators as an adult. Giant tyrannosauroids exemplify this ecological role in many Late Cretaceous food webs.

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