I imagine a good number of younger readers do not recall having to hose
down and scrape the car after a drive in the country, or even search an
automobile's bug screen (if you remember this) to collect insect
specimens, but I'm sure bird observers are aware of the role of insects
in healthy bird populations. There have not been a lot of well-conducted
studies on overall declines of insect populations, but
careful attention is being paid: see
http://www.sciencemag.org/news/2017/05/where-have-all-insects-gone  .
Rest assured that declining numbers of bugs can't be blamed on the birds.
Bill Whan

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