Observation on Life Habits of Pica pica in Typical Forestland of Tianzhu Area of Gansu

During 2015-2019, fixed point observations were conducted on the nesting, breeding and foraging behaviors of Pica pica in farmland shelterbelt, four-side trees, highway greenbelt and garden scenic forestland in Tianzhu county, Gansu province. The result demonstrated that P. pica usually nested on top of large Populus cathayana in survey points in July-August, and lay eggs. It breeds once a year, with 4-6 eggs every nest. Female spends 20-23 days for hatching, and female and male spends about 30 days for brooding, then fledglings leave. The distance nest of decreased with year increased, but the nest density was increased. Nest height, egg number, hatching period, hatching rate, foraging radius and different food rate had no great difference among different observation points. The average of nest distance, nest height, nest density, egg number, hatching period, hatching rate, foraging radius, rate of plant, insect and the food in different year were 1 142.85 m, 15.79 m, 1.23 nest/ha, 5.52 egg/nest, 21.09 day, 50.50%, 3 717.84 m, 85.04%, 11.05% and 3.91%.