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Journal article
Inner ear anatomy is a proxy for deducing auditory capability and behaviour in reptiles and birds
Inferences of hearing capabilities and audition-related behaviours in extinct reptiles and birds have previously been based on comparing cochlear duct dimensions with those of living species. However, the relationship between inner-ear bony anatomy and hearing ability or vocalization has never been tested rigorously in extant or fossil taxa. Here, micro-computed...Walsh, Stig A ; Barrett, Paul M ; Milner, Angela C ; Manley, Geoffrey ; Witmer, Lawrence M
reptile, bird, hearing, papilla, basilar, duct, vocalization, and cochlear
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Journal article
Virtual brain endocasts shed new light on the early evolution of modern birds (Neornithes)
This article is included in 'Program and Abstracts', 72nd Annual Meeting Society of Vertebrate Paleontology, October 17—20, 2012.Bourdon, Estelle ; Milner, A C ; Walsh, Stig A
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Journal article
Halcyornis toliapicus (aves: Lower Eocene, England) indicates advanced neuromorphology in Mesozoic Neornithes
Our recent X-ray micro computer-tomographic (μCT) investigations of Prophaethon shrubsolei and Odontopteryx toliapica from the Lower Eocene London Clay Formation of England revealed the avian brain to have been essentially modern in form by 55 Ma, but that an important vision-related synapomorphy of living birds, the eminentia sagittalis of the...Walsh, Stig A ; Milner, Angela C
Eocene, eminentia sagittalis, London clay, Halcyornis toliapicus, endocranial cast, and brain evolution
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Journal article
Inner ear sensory system changes as extinct crocodylomorphs transitioned from land to water
Major evolutionary transitions, in which animals develop new body plans and adapt to dramatically new habitats and lifestyles, have punctuated the history of life. The origin of cetaceans from land-living mammals is among the most famous of these events. Much earlier, during the Mesozoic Era, many reptile groups also moved...Schwab, Julia A ; Young, Mark T ; Neenan, James M ; Walsh, Stig A ; Witmer, Lawrence M …
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Journal article
Tempo and pattern of avian brain size evolution
Relative brain sizes in birds can rival those of primates, but large-scale patterns and drivers of avian brain evolution remain elusive. Here, we explore the evolution of the fundamental brain-body scaling relationship across the origin and evolution of birds. Using a comprehensive dataset sampling> 2,000 modern birds, fossil birds, and...Ksepka, Daniel T ; Balanoff, Amy M ; Smith, N Adam ; Bever, Gabriel S ; Bhullar, Bhart-Anjan S …
neurobiology, co-variation, encephalization, endocast, allometry, paleontology, and aves
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Book chapter
The evolution of avian intelligence and sensory capabilities: the fossil evidence
Crocodiles and birds are the only living representatives of Archosauria, a once diverse clade of vertebrates that mastered terrestrial, aerial and aquatic environments during the Mesozoic. Because the braincases of archosaurs are largely ossified, the group has particularly benefited from advances in non-destructive visualisation of endocranial structures over the past...Walsh, Stig A ; Knoll, F
Neurosensory evolution, Wulst, Dinosaur, Flocculus, and Bird
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Journal article
Sea dragons of Avalon
Tourists driving through the village2 of Street on their way to Glastonbury might well wonder at the representation of a skeleton on the road sign. Could this perhaps be a warning that this stretch of the A39 is a roadkill hotspot? I (Stig Walsh, once a local inhabitant) suspect that...Walsh, Stig A ; Taylor, Michael A
Street, ichthyosaur, plesiosaur, Somerset, Triassic, and Jurassic
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Book chapter
Reptiles
The coastline of Dorset exposes a long squence of Jurassic age sedimentary rocks which, with its wealth of invertebrate, vertebrate and plant fossils. From the pioneering work of early collectors like Mary Anning onwards, the area has been a cradle of palaeontology. The Lower Lias is particularly fossiliferous and this...Walsh, Stig A ; Milner, Angela C
reptile, fossil Jurassic, and Lias