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Article History

Received: 13 August 2025

Accepted: 12 November 2025

First Online: 11 February 2026

Declarations

:

: We chose a protocol specifically designed to minimise any impact on the primates studied. To that end, our auditory measurements were conducted only during the annual health checks routinely performed by the participating zoos and wildlife parks, in full compliance with national animal welfare regulations in France. As anaesthesia was administered solely for veterinary purposes—as part of routine clinical care and not for research—and given that the auditory test employed stimulus intensity levels comparable to those used in neonatal human hearing screening (80–84 dB), no authorisation was required from the French Ministry of Research (Autorisation de Projet à des Fins Scientifiques, APAFIS). Owing to the specific nature of both the procedure and the test employed, this work does not fall within the scope of experimental procedures requiring approval under Article R.214-99 of the French Rural Code, and consequently, no associated procedure number applies.

: All authors consent to publish this paper.

: The authors declare that they have no competing financial interests.