Review of the fossil record of ornithischian dinosaurs from Southeast Asia and southern China is published by Manitkoon et al. (2023) [179]

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Osteological comparisons and historical accounts of recently extinct island night herons are presented by Hume (2023). [275]A study on the microstructure of the tooth and periodontium attachment tissues of Pterodaustro guinazui is published by Cerda & Codorniú (2023), who report that teeth of this pterosaur were set in a groove with no interdental separation, and find no evidence for gomphosis or the presence of replacement teeth. [297] A study on the evolutionary history of the elephant birds, based on data from fossil eggshells, is published by Grealy et al. (2023), who interpret their findings as supporting the placement of Mullerornis into a separate family, as well as indicative of the existence of a genetically distinct lineage of Aepyornis in Madagascar's far north, report evidence of divergence within Aepyornis corresponding with the onset of the Quaternary, and tentatively advocate synonymising Vorombe titan with Aepyornis maximus. [260] Putative avialan teeth from the Late Cretaceous of Alberta, Canada are reinterpreted as belonging to crocodylians by Mohr, Acorn & Currie (2023). [322] Girard, L. C.; De Sousa Oliveira, S.; Raselli, I.; Martin, J. E.; Anquetin, J. (2023). "Description and phylogenetic relationships of a new species of Torvoneustes (Crocodylomorpha, Thalattosuchia) from the Kimmeridgian of Switzerland". PeerJ. 11. e15512. doi: 10.7717/peerj.15512. PMC 10362849. PMID 37483966.

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Ecomorphology of the penguin wing is studied by Haidr (2023), finding that Madrynornis resembled extant piscivorous penguins in its wing morphology. [270] A study on the bone histology of the holotype specimen of Parvicursor remotus is published by Averianov et al. (2023), who interpret this specimen as a young individual, not more than one year old, and reevaluate the course of alvarezsaurid miniaturization inferred by Qin et al. (2021), [130] finding no compelling morphological data indicating that parvicursorine alvarezsaurids fed on colonies of social insects and that their miniaturization was related to myrmecophagy. [131] A study aiming to determine the diets of members of the family Bohaiornithidae is published by Miller et al. (2023), who interpret their findings as indicating that the family included taxa adapted to diverse diets, and predict the ancestral member of Enantiornithes to have been a generalist which ate a wide variety of foods. [248] A study on causes of recovery of different interrelationships of the three major dinosaur clades (Theropoda, Sauropodomorpha, and Ornithischia) in phylogenetic studies is published by Černý & Simonoff (2023), who find the three possible ways of resolving the relationships among these lineages (Saurischia-Ornithischia, Ornithischiformes-Theropoda and Ornithoscelida-Sauropodomorpha dichotomies) to be statistically indistinguishable and supported by nearly equal numbers of characters in the datasets from the studies of Baron, Norman & Barrett (2017) [69] and Langer et al. (2017). [70] [71] This 2023 calendar is contemporary, minimalist, and stylish. It’s a great calendar for the home but looks equally as stunning in a planner.

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Figueiredo et al. (2023) report a partial coracoid of the genus Morus from the middle Miocene ( Langhian) of the Setúbal Peninsula ( Portugal), an instance that represents the first Miocene sulid described from the Iberian Peninsula. [272] A study on the evolution of forelimb muscle mechanics and function in ornithischian dinosaurs is published by Dempsey et al. (2023), who interpret their findings as indicating that thyreophorans, ornithopods and ceratopsians evolved quadrupedality through different patterns of rearrangement of forelimb musculature. [178] Carr (2023) redescribes the hindlimb of the lectotype of Alectrosaurus olseni, describes a partial tyrannosauroid skull from the Iren Dabasu Formation (China) with similarities to skulls of Raptorex kriegsteini and juvenile Tyrannosaurus rex, and questions the assignment of fossil material from Mongolia and Uzbekistan to the genus Alectrosaurus. [123]