Acoustic communication in crocodilians: from behaviour to brain

Area of Science:

• Zoology
• Animal Behavior
• Bioacoustics

Background:

• Crocodilians and birds are modern archosaurs, offering insights into extinct relatives.
• Understanding crocodilian behavior, particularly acoustic communication, is limited compared to birds.
• Acoustic communication plays a role in parental care for both groups.

Purpose of the Study:

• To review current knowledge of acoustic communication in crocodilians.
• To identify research gaps in sound production, hearing, and neuroanatomy.
• To stimulate further research in crocodilian bioacoustics.

Main Methods:

• Literature review of existing studies on crocodilian vocalizations and hearing.
• Comparative analysis of crocodilian and avian acoustic communication and auditory systems.
• Identification of knowledge gaps through synthesis of current research.

Main Results:

• Juvenile crocodilian calls include hatching, contact, distress, and threat calls.
• Adult crocodilian calls include bellows, maternal growls, and hisses.
• Sound production mechanisms and neural control are poorly understood.
• Crocodilian hearing is adapted for air and water, with similarities to birds.
• Auditory neuroanatomy shows avian-like features, but telencephalic areas need more study.

Conclusions:

• Acoustic communication is vital in crocodilian life, especially during parental care.
• Significant research is needed to fully understand crocodilian vocalizations and auditory processing.
• Comparative studies with birds offer valuable insights but highlight specific areas for crocodilian research.