why numbers of birds has dwindled over past few years ?
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North American birds declined by some data came from almost 50 years of monitoring ... Also, shorebirds, which have struggled in the past, lost more ...
About one in eight bird species is threatened with global extinction due to factors such as the expansion of agriculture, logging, invasive species, hunting, and climate change, according to a new report from the conservation
Forty Percent of the World's Bird Populations Are in Decline,
Completing a moult of all feathers takes several weeks. During this period birds look rather scruffy, and while they are moulting their wing feathers, they are less able to escape predators. ... Depending on the location, this can cause a sudden disappearance of these birds from residential areas and gardens.
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