Acoustic analyses of potential vocalization in lambeosaurine dinosaurs (Reptilia: Ornithischia)

  title={Acoustic analyses of potential vocalization in lambeosaurine dinosaurs (Reptilia: Ornithischia)},
  author={David B Weishampel},
  pages={252 - 261}
Lambeosaurine dinosaur crests are judged to have been conducive to resonation on the basis of an acoustic analysis of the structure of the nasal cavity. Size and shape of the nasal cavity suggest low vocal frequencies in adults, as does information on potential auditory acuity in these animals. Lateral diverticula (present in all but juvenile specimens) acted to suppress portions of the vocal spectrum. Juveniles vocalized at higher frequencies than adults and potential auditory sensitivity at… 

A Chinese alligator in heliox: formant frequencies in a crocodilian

Frequency peaks in bellows of a Chinese alligator breathing a helium–oxygen mixture instead of air shift to significantly higher frequencies, showing that crocodilian vocalizations contain vocal resonance frequencies or ‘formants’.

Acoustic communication in crocodilians: from behaviour to brain

The aim of this review is to summarize current knowledge about acoustic communication in crocodilians, from sound production to hearing processes, and to stimulate research in this field.

Common evolutionary origin of acoustic communication in choanate vertebrates

Evidence for 53 species of four major clades (turtles, tuatara, caecilian and lungfish) in the form of vocal recordings and contextual behavioural information accompanying sound production is presented and it is suggested that acoustic communication is at least as old as the last common ancestor of all choanate vertebrates.

Formants provide honest acoustic cues to body size in American alligators

The description of formants as honest signals in a non-avian reptile combined with previous evidence from birds and mammals strongly suggests that the principle of honest signalling via vocal tract resonances may be a broadly shared trait among amniotes.

Endocranial Anatomy of Lambeosaurine Hadrosaurids (Dinosauria: Ornithischia): A Sensorineural Perspective on Cranial Crest Function

The large brains of lambeosaurines are consistent with the range of social behaviors inferred when the crest is interpreted as an intraspecific signaling structure.

Brain anatomy of Amurosaurus riabinini and some neurobiological peculiarities of duck-billed dinosaurs

The most important neurobiological features of Amurosaurus riabinini and duck-billed dinosaurs integrally are discussed and it is established that the sense of smell played the major role in afferentation of hadrosaurids.

Vertebrate Bioacoustics: Prospects and Open Problems

Most known vocal peculiarities including air sacs, vocal fold modifications, the syringeal bulla present in most ducks, or the elongated trachea seen in many bird species are covered.

Fossil evidence of the avian vocal organ from the Mesozoic

The first remains, to the authors' knowledge, of a fossil syrinx from the Mesozoic Era are described, preserved in three dimensions in a specimen from the Late Cretaceous of Antarctica and show the fossilization potential of the avian vocal organ and beg the question why these remains have not been found in other dinosaurs.

Acoustic exaggeration of size in birds via tracheal elongation: comparative and theoretical analyses

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Hearing in the crocodilia.

  • E. Wever
  • Biology
    Proceedings of the National Academy of Sciences of the United States of America
  • 1971
All species of crocodilians show considerable similarity in their capabilities for sound reception, and all have the best sensitivity in a fairly broad middle range, and fall off for lower tones and particularly rapidly for the high tones.

Vocalization in juvenile crocodilians.

Evidence is presented that the grunts and distress calls of juvenile alligators are examples of graded calls, which are given in different form depending largely on contest.

The evolution of cranial display structures in hadrosaurian dinosaurs

  • J. Hopson
  • Environmental Science
  • 1975
A theory is presented that cranial crests of hadrosaurs were visual and acoustical display organs that evolved to form species-specific visual display organs in intraspecific combat.


The structure of the lambeosaurine nasal cavity is discussed and revised on the basis of ontogenetic and new anatomic information. The ascending tract from the external nares to the lateral

Responses of Captive Alligators to Auditory Stimulation

Roaring was accompanied by accurate localizing responses and by the adoption of an "aggressive approach" type of locomotion; and a smaller male was attacked repeatedly when placed in the tank with the roaring alligator.

Mechanisms of Sound Production in Delphinid Cetaceans: A Review and some Anatomical Considerations

It is concluded that the theories implicating the nasal sac systems of odontocete cetaceans in the production of sound are additionally supported by certain anatomical specializations adjacent to the tissues of this system.

Taxonomic Implications of Relative growth in Lambeosaurine Hadrosaurs

A fauna of 3 genera and 12 species of lambeosaurine hadrosaurs (crested duck-billed dinosaurs) from the Oldman Formation of southern Alberta is examined, finding niche differentiation by size among closely related species of large reptiles does not seem to be a feasible strategy.

Aspects of hadrosaurian cranial anatomy

Frontal-nasal and premaxillar- nasal fontanellae are distinguished in hadrosaurs; their presence is explained as connected with growth and considered to he responsible for the variability of crest structures.

Nest of juveniles provides evidence of family structure among dinosaurs

The discovery of fifteen hadrosaurian (‘duck-billed’) skeletons together in a nest-like structure offers the first tangible evidence of the social behaviour of at least one group of dinosaurs.


  • G. Manley
  • Biology
    Evolution; international journal of organic evolution
  • 1972
The functional significance of changes in the middle ear transmission system is discussed, particularly in connection with the origin of the mammalian middle ear, the development of large inner ear potentials and dimensionalChanges in the inner ear.