Table 1.

Usage frequency of artificial canopy bridge by the Hainan gibbon group during the three study periods in 2015–2019.

Recording period	No. of day	Number of crossing event	Frequency (event per day)
06 Dec 2015–19 Oct 2016	318	4	0.0126
18 Aug 2018–27 Nov 2018	102	27	0.2647
06 Jan 2019 –25 Feb 2019	50	21	0.4200