Long-term study reveals fluctuations in birds' nesting success

http://ift.tt/eA8V8J Understanding the factors that affect a bird species' nesting success can be crucial for planning effective conservation efforts. However, many studies of nesting birds last only a few years -- and that means they can miss the effects of long-term variation and rare events. A new study demonstrates this with nearly four decades of data from Song Sparrows in British Columbia.

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