 They also shared the feature of intramandibular articulation, something that is actually absent in "Archaeopteryx", but found in many of its theropod relatives.The brains of the "odontognath" birds appear to be somewhat simpler than those of modern birds and have retained some "reptilian" traits.Ornithologist Alan Feduccia has used this, and the presence of the intramandibular articulation (a trait also found in mosasaurs and living varanid lizards) as arguments that the Odontognathae and thus the birds as a whole have not evolved from theropod dinosaurs, but non-dinosaur thecodonts.