Bird song is a vocal behavior that serves as a means of territory defense and/or mate attraction during the breeding season. In non-Passeriformes birds, vocalizations are often simple and stereotyped, without song behavior. However, for certain non-Passeriformes birds, such as cuckoos (Cuculidae), their vocalizations, although stereotyped (Fig. 1), are also important in territory defense and attracting females, similar to the function of songs in Passeriformes birds. During the breeding season, birds face the trade-offs in investment between breeding and survival. Bird song as a costly sexually display, its activity can be influenced by bird′s life history and ambient environment. In this study, we investigated the daily variation of call activity of Large Hawk Cuckoo Hierococcyx sparverioides, based on recordings from Xiaolongmen National Forestry Park (40°00′N, 115°26′E) in Beijing. These audio recordings were collected with recorders (Wildlife Acoustics, USA) from May 30th to June 1st in 2016, and May 14th to June 25th in 2017. Detections of Large Hawk Cuckoo call events were obtained with automated sound recognition in Kaleidoscope Pro 4.0.3 software (Wildlife Acoustics, USA), with the accuracy rate and detection rate for detecting of 60.26% and 44.71%, respectively (Fig. 2). In general, there is more investment in vocal behavior in Large Hawk Cuckoo than most other sympatric bird species in our study area (Fig. 3). There were two peaks (more than 100 calls per hour in each recorder) in vocal output, with one around 3:00, and the other around 19:00 (Fig. 4). The Large Hawk Cuckoo also had nocturnal calls, with about 50 calls per hour in each recorder at midnight (Fig. 4). We discussed the potential relationship between daily vocal pattern and life history of the bird.