This poses a threat to bird populations, as fewer mating groups lead to fewer birds in future generations. (treehugger.com)
They must be given some kind of outside access, but in such confined spaces only few birds are ever able to actually make it outside. (vegansociety.com)
What s perhaps surprising, given the amount of attention it gets, is how few birds wind turbines kill in relation to other things. (savetheeaglesinternational.org)