Troodontidae

Troodontidae is a family of small to medium-sized theropod dinosaurs known from the Cretaceous Period. Its members are generally regarded as close relatives of birds.

Theropoda: Theropoda is the dinosaur group that includes birds and all other meat-eating dinosaurs. Troodontidae belongs within this broad branch of dinosaurs.
Troodontid teeth: Troodontid teeth are small, recurved teeth with distinctive serrations used to identify members of the family. Their shape and serrations help distinguish troodontid fossils and inform feeding hypotheses.
Troodon: Troodon is a dinosaur name historically applied to several North American fossils, whose classification remains disputed. The family name derives from this taxon, but its fossils do not securely define a single genus.
Troodontidae classification: Troodontidae classification is the taxonomic arrangement of genera and species assigned to the family. Assignments have shifted as researchers reassessed incomplete fossils and evolutionary relationships.
Paraves: Paraves is a group of theropod dinosaurs that includes birds and their closest non-avian relatives. Troodontids are usually placed among these bird-proximate theropods.
Troodontid endocasts: Troodontid endocasts are reconstructions of brain cavities from fossil skulls. They provide evidence about brain proportions and sensory anatomy.
Stenonychosaurus: Stenonychosaurus is a small troodontid dinosaur known from Late Cretaceous deposits in western North America. Its fossils were once assigned to Troodon and became central to debate over that genus.
Troodontid renaissance: The troodontid renaissance is a period of renewed research following major discoveries of new troodontid fossils in the late twentieth century. New fossils greatly expanded knowledge of the family's diversity and anatomy.
Maniraptora: Maniraptora is a group of theropod dinosaurs that includes birds and several feathered non-avian lineages. This broader group provides the evolutionary setting for troodontids.
Dromaeosauridae: Dromaeosauridae is a family of feathered theropod dinosaurs that includes Velociraptor and Deinonychus. Dromaeosaurids were close paravian relatives, but differ in characteristic anatomy such as the enlarged sickle claw.

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AnchiornisRelated: Troodontids are another bird-adjacent paravian group compared with Anchiornis in evolutionary studies.