As regular CFZ-watchers will know, for some time Corinna has been doing a column for Animals & Men and a regular segment on On The Track... particularly about out-of-place birds and rare vagrants. There seem to be more and more bird stories from all over the world hitting the news these days so, to make room for them all - and to give them all equal and worthy coverage - she has set up this new blog to cover all things feathery and Fortean.

Friday, 23 May 2014

The invisible killer threatening millions of migrating birds

By Aidan LewisBBC News, Washington

Every year, hundreds of millions of birds are killed or injured when they fly into windows. Volunteers who document the collisions are now calling for architects and landlords to make their buildings more bird friendly to reduce the number of deaths.

Sometimes birds see plants or empty spaces beyond the windows - sometimes they just see the reflection of the sky or trees, but not the glass itself.

Most tend to cruise at 20-30mph (32-48kph) - if they hit a window at that speed the impact is usually fatal as their beak is jammed back into the brain.

Although collisions can happen anywhere, they are most common in cities where big glass buildings proliferate.

Local birds seem to learn where they can fly safely but migratory songbirds such as warblers, thrushes and sparrows have a particular problem identifying glass.

They usually fly by night when they are less visible to predators and use the stars to navigate - but they appear to get confused by the illumination of towns and cities below.

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