Chignik Lake, Alaska Peninsula, June 19, 2019
Golf Courses laced with poisons, mosquito traps, bug zappers, Rotenone and other toxins used to remove undesired fish species (and incidentally aquatic insects) from streams, the biological desserts called lawns, industrial agriculture and that “little bit” of whatever “cide” sprayed on the family garden – and all the additional instances in which invertebrate populations are suppressed with toxins and by other means…
…also suppress bird populations.
Even among avian species that typically consume mostly seeds, nuts or nectar, in order for the mother to create viable eggs and for the babies to develop into healthy adults, the rich supply of nutrients insects provide are critical.
JD
CutterLight 
I urge everyone to keep night lights off or to a bare minimum outside their homes due to the fact that these lights discombobulate the directional cues of insects and they wind up smashing into said lights.
We were once horrified when upon staying at a certain campground we discovered that the proprietor used a lighted bug zapper to attract and kill insects. The carnage on the ground around these contraptions was sickening – including big, beautiful Luna Moths. He’d have done better with a nesting box or two for bats, and a few more for swallows.