The Hazards of Migration on Tuesday, February 16, 2010

It is estimated that half of migratory birds that head south for the winter do not live to return to breed in the spring.

Migration can be very dangerous for birds like the Violet-green Swallow (shown in sketch) and other birds that we welcome to the Portland area in the spring.

What are some of the causes of mortality during migration?

* Predation and bad weather are two natural causes.
* Collisions with tall buildings, windows, and other structures, being killed by hunters, and getting struck by automobiles are man-made dangers.
* The loss and degradation of stopover habitat not only results in more birds dying while on migration, but can also reduce nesting success. Late arrival, or arrival in poor condition, to the breeding ground because of inadequate food and rest en route jeopardizes a bird’s ability to reproduce.

How can we help migratory birds?

* Offer water, shelter, food and nesting sites on your property. 
* Landscape with native evergreen and fruit-bearing trees, shrubs, grasses and vines. 
* Design your garden for plants to flower and fruit throughout the spring, summer and fall. 
* Allow dead trees and brush piles to provide shelter, nest sites and food (insects).
* Provide a birdbath or other water source. 
* Resist using herbicides, fungicides and pesticides. 
* Offer bird feeders filled with seed, suet, fruit and nectar. 
* Support a conservation organization like Audubon Society or The Nature Conservancy.

STOP WINDOW STRIKES Decals like the hummingbird shapes illustrated in this sketch can help deter birds from flying into a window.  These reflect ultraviolet light, highly visible to birds but not to people.  These unobtrusive decals allow you to enjoy your view while they alert newcomers to the window glass.