You bring up an interesting point about how birds may perceive garden atriums/green walls in buildings and perhaps be killed trying to fly into them that I had not really thought much about before. What do you mean about "see-through" glass? Do you just mean non-reflective? I would think that both see through glass and reflective glass would confuse birds about the same.
This article is pretty informative:
http://www.planphilly.com/node/8416
Through a little reading, it seems that many birds collide with buildings at night while migrating, and that they are drawn in and confused by all the lights, so in Chicago, Toronto and some other cities, buildings are encouraged to dim/turn off their lights during peak bird migration times. This helps significantly reduce the number of killed/injured birds.
Fritting the glass is the most effective way to let the birds "see" the glass panes of the curtain wall. It is a tricky situation to deal with architecturally... If you are paying millions for a condo on a high floor in a glass highrise, it sucks to have your incredible view be diminished through a visible frit pattern. The pictures of the vast arrays of dead birds they have collected is quite sad. Hopefully the "lights-out" campaigns are successful in largely minimizing the number of birds killed, as I doubt we will see every building forced to have fritted glass anytime in the near future.
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