In the feeding condition in Cua Lo Town, Nghe An province, Viet Nam, adult Ptyas mucosa (P. mucosa) operates seasonally and day and night with the rule: The active season is from March to December and hibernating in January and February every year. For the rule of day and night operation: In March and April, they are mainly active from 6-18h; from May to July, they are operates at the 2 time periods: 7-11h (at most 8-10h), and 15-20h; In August, they are also operates 2 time periods, but from 5-11h, and 14 - 20h; From September to December, it operates at one period (6 or 7-19h), not active at night. The activity of adult P. mucosa is closely dependent on the temperature and humidity of the environment (20-40oC, 40-100%), the most favorable is 27-31oC, 76-92%. They officially hibernate in January and February when the ambient temperature is below 17oC for many days.