waterlesscloud at http://news.ycombinator.com/item?id=3903033 http://news.ycombinator.com/item?id=3903033: > Looking at the numbers they offer, it seems like i

waterlesscloud at http://news.ycombinator.com/item?id=3903033 http://news.ycombinator.com/item?id=3903033: > Looking at the numbers they offer, it seems like it's about 1 bird per tower every 4 days.