Preliminary observation on the ecological habits of picus canus 黑枕绿啄木鸟生态习性的初步观察
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Dusky thrush ( turdus naumanni ) , common magpie ( pica pica ) , bohemian waxwing ( bombycilla garrulus ) , grey - faced woodpecker ( picus canus ) mainly consists of single species , and the average population size is 6 . 26 individuals ( 1989 - 1990 ) and 7 . 44 individuals ( 2001 - 2002 ) , the mixed species population mainly consists of great tit ( parus major ) , marsh tit ( parus palustris ) , eurasian nuthatdch ( sitta europaed ) , the average species number is about 3 , average number is 7 . 4 individuals 冬季鸟类的集群明显，单种群主要为长尾山雀、斑鸦、喜鹊、太平鸟和黑枕绿啄木鸟群，每群平均个体数为6 26只门? 1990年）和7 44只（ 2001 2002年） ，混合群主要由大山雀、沼泽山雀和普通幅构成，每群平均种数在3种左右，平均个体数在7
