Acoustic communication is an essential communication channel for crocodiles. Indeed, they use acoustic signals throughout their lives, to ensure the survival of the juveniles and to interact socially. More in detail, previous studies showed that young crocodiles use a repertoire of graded signals: they use signals having similar basic acoustic structure to encode different messages. Nevertheless, observations show that these signals are treated as discrete rather than graded, i.e. the individuals’ behavioral responses seem to be stereotyped, suggesting a categorical processing of information. Categorical perception of acoustic signals has been well studied in the context of speech perception, but it is also an essential process in the animal reign, involved especially in the decision-making process. In a series of playback studies, we thus investigated whether young crocodiles are able to categorically perceive a range of biological pertinent signals and we examined in greater detail the acoustic basis of information coding in crocodiles’ vocalizations. We showed that crocodiles may use categorical perception to classify vocalizations and adaptively respond to them. Further analysis would allow us to highlight the acoustic parameters they used to discriminate and categorize these signals.