Call repertoire of an Australian treefrog, Litoria adelaidensis (Anura, Hylidae)

Litoria adelaidensis (Anura: Hylidae) has a call repertoire that includes two structurally different call types. Males produced three recognizable pulsed calls (call types 1 to 3) and one unpulsed call (call type 4). All call types have two distinct frequency peaks. Call type 1 was produced most often, suggesting that this signal functions to attract females. Call type 4 was rarely produced and may be associated with male-male interactions, as males in close proximity to each other were observed making this call. The purposes of call types 2 and 3 are unknown. The different calls may be part of a graded response incorporating both male-male interaction and female attraction.