The echidna manifests typical characteristics of rapid eye movement sleep

  title={The echidna manifests typical characteristics of rapid eye movement sleep},
  author={Stewart C. Nicol and Niels {\AA}kerstr{\o}m Andersen and NATHAN H. Phillips and Ralph J. Berger},
  journal={Neuroscience Letters},
The failure to identify rapid eye movement sleep (REMS) in an early study of the echidna at an unmeasured ambient temperature (T(a)) was unexpected, as its brain stem structures resemble those that generate REMS in other mammals. However, typical mammalian REMS was evident in echidnas exposed to several T(a)s. The parallel presence of REMS in birds points to its reptilian origin. 
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Temperature regulation in the echidna (Tachyglossus aculeatus)
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Heat tolerance of monotremes
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The complete mitochondrial genome of the wallaroo (Macropus robustus) and the phylogenetic relationship among Monotremata, Marsupialia, and Eutheria.
  • A. Janke, X. Xu, Ú. Árnason
  • Biology, Medicine
  • Proceedings of the National Academy of Sciences of the United States of America
  • 1997
The complete mitochondrial DNA (mtDNA) of the wallaroo was sequenced and rejected significantly the commonly acknowledged Theria hypothesis, according to which Marsupialia and Eutheria are grouped together to the exclusion of Monotremata. Expand
The foraging ecology of a termite‐and ant‐eating specialist, the echidna Tachyglossus aculeatus (Monotremata: Tachyglossidae)
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