Description of the Advertisement and Aggressive Calls of the Enigmatic Trinidad Thin-Toed Frog Leptodactylus nesiotus

Research on elusive amphibians is challenging, resulting in a lack of basic information on their natural history. This is the case of Leptodactylus nesiotus, a rare and elusive frog found in a small swamp in the southwestern peninsula of the island of Trinidad (West Indies). Here, we provide additional call descriptions for data collected in the field (Trinidad) and laboratory in 2004, including descriptions of both advertisement and aggressive calls. The notes in the advertisement calls were divided in two types of pulses, both lasting on average less than 0.04 s and with average peak frequencies less than 16,000 Hz. The aggressive calls also displayed two types of pulses lasting 0.06 s maximum on average and with highest average peak frequency of 1,612 Hz. The only significant difference between these two call types relates to the temporal structures, but a larger dataset is needed to confirm the pattern. There were no temporal significant differences between the calls described here and the ones described in earlier literature, although we provide a more detailed call description.