Parent–offspring communication in the Nile crocodile Crocodylus niloticus: do newborns’ calls show an individual signature?

@article{Vergne2006ParentoffspringCI,
  title={Parent–offspring communication in the Nile crocodile Crocodylus niloticus: do newborns’ calls show an individual signature?},
  author={Am{\'e}lie L. Vergne and Alexis Avril and Samuel Martin and Nicolas Mathevon},
  journal={Naturwissenschaften},
  year={2006},
  volume={94},
  pages={49-54}
}
Young Nile crocodiles Crocodylus niloticus start to produce calls inside the egg and carry on emitting sounds after hatching. These vocalizations elicit maternal care and influence the behaviour of other juveniles. In order to investigate the acoustic structure of these calls, focusing on a possible individual signature, we have performed acoustic analyses on 400 calls from ten young crocodiles during the first 4 days after hatching. Calls have a complex acoustic structure and are strongly… 
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33 Citations

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C crocodilians have the most complex acoustic repertoire, especially during the early stages of their life, having different functions according to their stimulus and being classified as hatching, contact, annoyance, threat and distress calls.
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TLDR
The Paraguayan caiman (Caiman yacare) is the main Caimaninae species occurring in the Brazilian Pantanal Wetland and it is hypothesized that the variation in the distress call pattern may be associated to a low specificity in sound recognition by adult caimans.
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RESPONSES OF JUVENILE AMERICAN ALLIGATORS (ALLIGATOR MISSISSIPPIENSIS) TO CONTACT CALLS
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This study tests juvenile American alligators' ability to respond via movement and callback vocalizations to pre-recorded conspecific contact calls across a large sample size, and tests for relationships between response rates and juvenile body size and sex.
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