American Kestrels have been putting on a great air show on the Erie Landfill in North Arlington in recent weeks.
   We saw at least four working the site last week, zipping about and then hovering when they eyed prey.
   The Meadowlands Commission has put up kestrel nesting boxes at Erie in hopes of getting them to breed here.
   Kestrels, a small falcon, have declined at an "alarming" rate in New Jersey, according to the state’s Endangered and Non-Game Species Program.
   It is particularly encouraging to see so many of them at once.
   More on kestrels here.
   More on kestrels in New Jersey here (click American Kestrel).