Neotropical migratory birds from warblers to sparrows are declining at alarming rates-rates that are not sustainable .
新热带区候鸟从莺鸟到麻雀都会以惊人的速度往下飞这种速率是不能忍受的。
For example , in europe , study has been done of blackcap warblers . We just call them blackcaps .
比方说，在欧洲，关于黑顶莺做过了一些研究，我们仅仅把它们叫做黑顶。
So they 're pretty close to the ground , but these warblers also nest in forests that have low shrub density .
所以，它们倾向于接近地面，但是这些蓝莺也会在有着稀疏灌木丛的森林里面筑巢。
Cuckoos would have good reason to do so , since the warblers and other small birds in whose nests theylay their eggs are understandably frightened of hawks , and give them a wide berth .
Our winter visitors , including swans , short-eared owls , meadow larks and shrikes , are departing for their breeding grounds , while swallows , warblers , hummingbirds , thrushes and other species are arriving for the nesting season here .
