多年来他一直观察鸟类的行为。
他经常观察鸟类的行为。
观鸟者观察各种新的物种，从中他们不止能认识不同的鸟种，还能学到关于迁徙、鸟类行为学、食性、求爱还有鸟类领地的知识。
As birders observe new species, they not only learn about different birds, but they also learn about migration, bird behavior, feed preferences, courtship and bird territories.
对11种食肉质果鸟类的喜食性、食量、取食行为等笼养观察。
Food palatability. food amounts and foraging behavior of 11 species of cagingbirds fed on fleshy-fruits were observed.
一个真正的“鸟人”会积极观察和研究，以便看到新的物种和学习更多鸟类的行为、栖息地和它们不同的个性。
A true "birder" actively observes and studies different birds in order to see new species and to learn more about their behavior, habitats and personalities.
一个真正的“鸟人”会积极观察和研究，以便看到新的物种和学习更多鸟类的行为、栖息地和它们不同的个性。
A true "birder" actively observes and studies different birds in order to see new species and to learn more about their behavior, habitats and personalities.
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