This site describes the Troodontidae, a small group (maybe five different species) of very rare and hence poorly known maniraptorans. They are only known from a few incomplete specimens from the Cretaceous period of North America and Mongolia, so their exact affinities to other maniraptorans are uncertain. Their morphology is described in terms of locomotion and other activities and the size of their brain case. Active links are provided for further studies.
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Subject: Biology Resource Type: Scientific Resources:Overview/Reference Work Grade Level: College Upper (15-16), College Lower (13-14), High School (9-12) Focus on the Cretaceous: PaleontologyKeywords: Saurornithoides, Troodon, Sinornithoides, Cretaceous