Do you feed the birds? According to Discovery News, more than 40% of U.S. households and nearly 50% of U.K. households feed wild birds. While it may seem like the right thing to do when several feet of snow cover the ground and freezing temperatures linger for weeks, a pair of new studies finds that springtime feeding may be a disservice to wild birds.
Studies were conducted in England by the University of Birmingham and in Norway by the University of Basel. They compared birds provided with food at feeders with those in a similar area that found their own food. The fed birds:
- Laid their eggs earlier
- Incubated the eggs for less time before they hatched
- Had smaller clutches (laid fewer eggs)
- Had a reduced percentage of eggs hatch (one of two types of birds showed this)
- Delayed morning chorus by 20 minutes (in Norway)
Those involved with the study think that the fed birds may be spending more time defending the territory surrounding the feeders. In the case of the delayed singing, it could be that they are distracted by other birds feeding in their territory. James Reynolds, the main researcher, says that further study is still needed.
Other resources suggest that it's still okay to feed birds in the spring. They say that some species may be migrating through your area and are still traveling to reach their breeding grounds. Others advocate that parents have high energy requirements when they are feeding their young.
Resources:
http://news.discovery.com/animals/bird-feeders-breeding-110125.html#mkcpgn=rssnws1
http://www.thestar.com/news/sciencetech/article/929056--does-feeding-birds-affect-breeding-yes-says-one-scientist
http://www.birds.cornell.edu/AllAboutBirds/faq/season/spring/document_view
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